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Remove everything, rewrite of AMS starts here

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.travis.yml
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language: ruby
rvm:
- 1.9.3
- 2.0.0
- jruby-19mode
- rbx-19mode
gemfile:
- Gemfile
- Gemfile.edge
matrix:
allow_failures:
- gemfile: Gemfile.edge
notifications:
email: false
campfire:
on_success: change
rooms:
- secure: "TP0fJ4aqXCRD7CaAgaYW7Pa22j4/uLChdBb59ob/sJvHtfi4Zx3I54xWApmp\nZl1KItFGCV8oQZhQl5hAmHJfJ+1gCNeBvIKwY6TsIyTmyDg1KcJUcJDrwYxO\ntAeYI2PvU5PtKMmpnfnwFQMxL+2nfWJWNzboBCDr4YvoFI+rN+A="

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CHANGELOG.md
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# UNRELEASED
* ActiveModel::Serializable was created it has the shared code between
AM::Serializer and AM::ArraySerializer. Basically enable objects to be
serializable by implementing an options method to handle the options
of the serialization and a serialize method that returns an object to
be converted to json by the module. This also removes duplicate code.
https://github.com/rails-api/active_model_serializers/commit/6c6bc8872d3b0f040a200854fa5530a775824dbf
* ActiveModel::Serializer::Caching module was created it enables
Serializers to be able to cache to\_json and serialize calls. This
also helps removing duplicate code.
https://github.com/rails-api/active_model_serializers/commit/3e27110df78696ac48cafd1568f72216f348a188
* We got rid of the Association.refine method which generated
subclasses.
https://github.com/rails-api/active_model_serializers/commit/24923722d4f215c7cfcdf553fd16582e28e3801b
* Associations doesn't know anymore about the source serializer.
That didn't make any sense.
https://github.com/rails-api/active_model_serializers/commit/2252e8fe6dbf45660c6a35f35e2423792f2c3abf
https://github.com/rails-api/active_model_serializers/commit/87eadd09b9a988bc1d9b30d9a501ef7e3fc6bb87
https://github.com/rails-api/active_model_serializers/commit/79a6e13e8f7fae2eb4f48e83a9633e74beb6739e
* Passing options[:hash] is not public API of include!. That was
removed.
https://github.com/rails-api/active_model_serializers/commit/5cbf9317051002a32c90c3f995b8b2f126f70d0c
* ActiveModel::Serializer::Associations::Config is now
ActiveModel::Serializer::Association but it's an internal
thing so shouldn't bother.
ActiveModel::Serializer::Associations::Has\* are now
ActiveModel::Serializer::Association::Has\* and inherit from
ActiveModel::Serializer::Association
https://github.com/rails-api/active_model_serializers/commit/f5de334ddf1f3b9764d914a717311532021785d2
https://github.com/rails-api/active_model_serializers/commit/3dd422d99e8c57f113880da34f6abe583c4dadf9
* serialize\_ids call methods on the corresponding serializer if they
are defined, instead of talking directly with the serialized object.
Serializers are decorators so we shouldn't talk directly with
serialized objects.
* Array items are not wrapped anymore in root element.
* Remove support for ruby 1.8 versions.
* Require rails >= 3.2.
# VERSION 0.8.1
* Fix bug whereby a serializer using 'options' would blow up.
# VERSION 0.8.0
* Attributes can now have optional types.
* A new DefaultSerializer ensures that POROs behave the same way as ActiveModels.
* If you wish to override ActiveRecord::Base#to\_Json, you can now require
'active\_record/serializer\_override'. We don't recommend you do this, but
many users do, so we've left it optional.
* Fixed a bug where ActionController wouldn't always have MimeResponds.
* An optinal caching feature allows you to cache JSON & hashes that AMS uses.
Adding 'cached true' to your Serializers will turn on this cache.
* URL helpers used inside of Engines now work properly.
* Serializers now can filter attributes with `only` and `except`:
```
UserSerializer.new(user, only: [:first_name, :last_name])
UserSerializer.new(user, except: :first_name)
```
* Basic Mongoid support. We now include our mixins in the right place.
* On Ruby 1.8, we now generate an `id` method that properly serializes `id`
columns. See issue #127 for more.
* Add an alias for `scope` method to be the name of the context. By default
this is `current_user`. The name is automatically set when using
`serialization_scope` in the controller.
* Pass through serialization options (such as `:include`) when a model
has no serializer defined.
# VERSION 0.7.0
* ```embed_key``` option to allow embedding by attributes other than IDs
* Fix rendering nil with custom serializer
* Fix global ```self.root = false```
* Add support for specifying the serializer for an association as a String
* Able to specify keys on the attributes method
* Serializer Reloading via ActiveSupport::DescendantsTracker
* Reduce double map to once; Fixes datamapper eager loading.
# VERSION 0.6.0
* Serialize sets properly
* Add root option to ArraySerializer
* Support polymorphic associations
* Support :each_serializer in ArraySerializer
* Add `scope` method to easily access the scope in the serializer
* Fix regression with Rails 3.2.6; add Rails 4 support
* Allow serialization_scope to be disabled with serialization_scope nil
* Array serializer should support pure ruby objects besides serializers
# VERSION 0.5.0 (May 16, 2012)
* First tagged version
* Changes generators to always generate an ApplicationSerializer

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CONTRIBUTING.md
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Contributing to AMS
===================
First of all, **thank you**!
Now, for the details:
Please file issues on the [GitHub Issues
list](https://github.com/rails-api/active_model_serializers/issues).
Please discuss new features or ask for feedback about a new feature [on
rails-api-core](https://groups.google.com/forum/#!forum/rails-api-core).
If you want a feature implemented, the best way to get it done is to submit a
pull request that implements it. Tests and docs would be nice.
Please include a CHANGELOG with all entries that change behavior.
:heart: :sparkling_heart: :heart:

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DESIGN.textile
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<strong>This was the original design document for serializers.</strong> It is useful mostly for historical purposes as the public API has changed.
h2. Rails Serializers
This guide describes how to use Active Model serializers to build non-trivial JSON services in Rails. By reading this guide, you will learn:
* When to use the built-in Active Model serialization
* When to use a custom serializer for your models
* How to use serializers to encapsulate authorization concerns
* How to create serializer templates to describe the application-wide structure of your serialized JSON
* How to build resources not backed by a single database table for use with JSON services
This guide covers an intermediate topic and assumes familiarity with Rails conventions. It is suitable for applications that expose a
JSON API that may return different results based on the authorization status of the user.
h3. Serialization
By default, Active Record objects can serialize themselves into JSON by using the `to_json` method. This method takes a series of additional
parameter to control which properties and associations Rails should include in the serialized output.
When building a web application that uses JavaScript to retrieve JSON data from the server, this mechanism has historically been the primary
way that Rails developers prepared their responses. This works great for simple cases, as the logic for serializing an Active Record object
is neatly encapsulated in Active Record itself.
However, this solution quickly falls apart in the face of serialization requirements based on authorization. For instance, a web service
may choose to expose additional information about a resource only if the user is entitled to access it. In addition, a JavaScript front-end
may want information that is not neatly described in terms of serializing a single Active Record object, or in a different format than.
In addition, neither the controller nor the model seems like the correct place for logic that describes how to serialize an model object
*for the current user*.
Serializers solve these problems by encapsulating serialization in an object designed for this purpose. If the default +to_json+ semantics,
with at most a few configuration options serve your needs, by all means continue to use the built-in +to_json+. If you find yourself doing
hash-driven-development in your controllers, juggling authorization logic and other concerns, serializers are for you!
h3. The Most Basic Serializer
A basic serializer is a simple Ruby object named after the model class it is serializing.
<pre lang="ruby">
class PostSerializer
def initialize(post, scope)
@post, @scope = post, scope
end
def as_json
{ post: { title: @post.name, body: @post.body } }
end
end
</pre>
A serializer is initialized with two parameters: the model object it should serialize and an authorization scope. By default, the
authorization scope is the current user (+current_user+) but you can use a different object if you want. The serializer also
implements an +as_json+ method, which returns a Hash that will be sent to the JSON encoder.
Rails will transparently use your serializer when you use +render :json+ in your controller.
<pre lang="ruby">
class PostsController < ApplicationController
def show
@post = Post.find(params[:id])
render json: @post
end
end
</pre>
Because +respond_with+ uses +render :json+ under the hood for JSON requests, Rails will automatically use your serializer when
you use +respond_with+ as well.
h4. +serializable_hash+
In general, you will want to implement +serializable_hash+ and +as_json+ to allow serializers to embed associated content
directly. The easiest way to implement these two methods is to have +as_json+ call +serializable_hash+ and insert the root.
<pre lang="ruby">
class PostSerializer
def initialize(post, scope)
@post, @scope = post, scope
end
def serializable_hash
{ title: @post.name, body: @post.body }
end
def as_json
{ post: serializable_hash }
end
end
</pre>
h4. Authorization
Let's update our serializer to include the email address of the author of the post, but only if the current user has superuser
access.
<pre lang="ruby">
class PostSerializer
def initialize(post, scope)
@post, @scope = post, scope
end
def as_json
{ post: serializable_hash }
end
def serializable_hash
hash = post
hash.merge!(super_data) if super?
hash
end
private
def post
{ title: @post.name, body: @post.body }
end
def super_data
{ email: @post.email }
end
def super?
@scope.superuser?
end
end
</pre>
h4. Testing
One benefit of encapsulating our objects this way is that it becomes extremely straight-forward to test the serialization
logic in isolation.
<pre lang="ruby">
require "ostruct"
class PostSerializerTest < ActiveSupport::TestCase
# For now, we use a very simple authorization structure. These tests will need
# refactoring if we change that.
plebe = OpenStruct.new(super?: false)
god = OpenStruct.new(super?: true)
post = OpenStruct.new(title: "Welcome to my blog!", body: "Blah blah blah", email: "tenderlove@gmail.com")
test "a regular user sees just the title and body" do
json = PostSerializer.new(post, plebe).to_json
hash = JSON.parse(json)
assert_equal post.title, hash.delete("title")
assert_equal post.body, hash.delete("body")
assert_empty hash
end
test "a superuser sees the title, body and email" do
json = PostSerializer.new(post, god).to_json
hash = JSON.parse(json)
assert_equal post.title, hash.delete("title")
assert_equal post.body, hash.delete("body")
assert_equal post.email, hash.delete("email")
assert_empty hash
end
end
</pre>
It's important to note that serializer objects define a clear interface specifically for serializing an existing object.
In this case, the serializer expects to receive a post object with +name+, +body+ and +email+ attributes and an authorization
scope with a +super?+ method.
By defining a clear interface, it's must easier to ensure that your authorization logic is behaving correctly. In this case,
the serializer doesn't need to concern itself with how the authorization scope decides whether to set the +super?+ flag, just
whether it is set. In general, you should document these requirements in your serializer files and programatically via tests.
The documentation library +YARD+ provides excellent tools for describing this kind of requirement:
<pre lang="ruby">
class PostSerializer
# @param [~body, ~title, ~email] post the post to serialize
# @param [~super] scope the authorization scope for this serializer
def initialize(post, scope)
@post, @scope = post, scope
end
# ...
end
</pre>
h3. Attribute Sugar
To simplify this process for a number of common cases, Rails provides a default superclass named +ActiveModel::Serializer+
that you can use to implement your serializers.
For example, you will sometimes want to simply include a number of existing attributes from the source model into the outputted
JSON. In the above example, the +title+ and +body+ attributes were always included in the JSON. Let's see how to use
+ActiveModel::Serializer+ to simplify our post serializer.
<pre lang="ruby">
class PostSerializer < ActiveModel::Serializer
attributes :title, :body
def serializable_hash
hash = attributes
hash.merge!(super_data) if super?
hash
end
private
def super_data
{ email: @post.email }
end
def super?
@scope.superuser?
end
end
</pre>
First, we specified the list of included attributes at the top of the class. This will create an instance method called
+attributes+ that extracts those attributes from the post model.
NOTE: Internally, +ActiveModel::Serializer+ uses +read_attribute_for_serialization+, which defaults to +read_attribute+, which defaults to +send+. So if you're rolling your own models for use with the serializer, you can use simple Ruby accessors for your attributes if you like.
Next, we use the attributes method in our +serializable_hash+ method, which allowed us to eliminate the +post+ method we hand-rolled
earlier. We could also eliminate the +as_json+ method, as +ActiveModel::Serializer+ provides a default +as_json+ method for
us that calls our +serializable_hash+ method and inserts a root. But we can go a step further!
<pre lang="ruby">
class PostSerializer < ActiveModel::Serializer
attributes :title, :body
private
def attributes
hash = super
hash.merge!(email: post.email) if super?
hash
end
def super?
@scope.superuser?
end
end
</pre>
The superclass provides a default +initialize+ method as well as a default +serializable_hash+ method, which uses
+attributes+. We can call +super+ to get the hash based on the attributes we declared, and then add in any additional
attributes we want to use.
NOTE: +ActiveModel::Serializer+ will create an accessor matching the name of the current class for the resource you pass in. In this case, because we have defined a PostSerializer, we can access the resource with the +post+ accessor.
h3. Associations
In most JSON APIs, you will want to include associated objects with your serialized object. In this case, let's include
the comments with the current post.
<pre lang="ruby">
class PostSerializer < ActiveModel::Serializer
attributes :title, :body
has_many :comments
private
def attributes
hash = super
hash.merge!(email: post.email) if super?
hash
end
def super?
@scope.superuser?
end
end
</pre>
The default +serializable_hash+ method will include the comments as embedded objects inside the post.
<pre lang="json">
{
post: {
title: "Hello Blog!",
body: "This is my first post. Isn't it fabulous!",
comments: [
{
title: "Awesome",
body: "Your first post is great"
}
]
}
}
</pre>
Rails uses the same logic to generate embedded serializations as it does when you use +render :json+. In this case,
because you didn't define a +CommentSerializer+, Rails used the default +as_json+ on your comment object.
If you define a serializer, Rails will automatically instantiate it with the existing authorization scope.
<pre lang="ruby">
class CommentSerializer
def initialize(comment, scope)
@comment, @scope = comment, scope
end
def serializable_hash
{ title: @comment.title }
end
def as_json
{ comment: serializable_hash }
end
end
</pre>
If we define the above comment serializer, the outputted JSON will change to:
<pre lang="json">
{
post: {
title: "Hello Blog!",
body: "This is my first post. Isn't it fabulous!",
comments: [{ title: "Awesome" }]
}
}
</pre>
Let's imagine that our comment system allows an administrator to kill a comment, and we only want to allow
users to see the comments they're entitled to see. By default, +has_many :comments+ will simply use the
+comments+ accessor on the post object. We can override the +comments+ accessor to limit the comments used
to just the comments we want to allow for the current user.
<pre lang="ruby">
class PostSerializer < ActiveModel::Serializer
attributes :title. :body
has_many :comments
private
def attributes
hash = super
hash.merge!(email: post.email) if super?
hash
end
def comments
post.comments_for(scope)
end
def super?
@scope.superuser?
end
end
</pre>
+ActiveModel::Serializer+ will still embed the comments, but this time it will use just the comments
for the current user.
NOTE: The logic for deciding which comments a user should see still belongs in the model layer. In general, you should encapsulate concerns that require making direct Active Record queries in scopes or public methods on your models.
h4. Modifying Associations
You can also rename associations if required. Say for example you have an association that
makes sense to be named one thing in your code, but another when data is serialized.
You can use the <code:key</code> option to specify a different name for an association.
Here is an example:
<pre lang="ruby">
class UserSerializer < ActiveModel::Serializer
has_many :followed_posts, key: :posts
has_one :owned_account, key: :account
end
</pre>
Using the <code>:key</code> without a <code>:serializer</code> option will use implicit detection
to determine a serializer. In this example, you'd have to define two classes: <code>PostSerializer</code>
and <code>AccountSerializer</code>. You can also add the <code>:serializer</code> option
to set it explicitly:
<pre lang="ruby">
class UserSerializer < ActiveModel::Serializer
has_many :followed_posts, key: :posts, serializer: CustomPostSerializer
has_one :owne_account, key: :account, serializer: PrivateAccountSerializer
end
</pre>
h3. Customizing Associations
Not all front-ends expect embedded documents in the same form. In these cases, you can override the
default +serializable_hash+, and use conveniences provided by +ActiveModel::Serializer+ to avoid having to
build up the hash manually.
For example, let's say our front-end expects the posts and comments in the following format:
<pre lang="json">
{
post: {
id: 1
title: "Hello Blog!",
body: "This is my first post. Isn't it fabulous!",
comments: [1,2]
},
comments: [
{
id: 1
title: "Awesome",
body: "Your first post is great"
},
{
id: 2
title: "Not so awesome",
body: "Why is it so short!"
}
]
}
</pre>
We could achieve this with a custom +as_json+ method. We will also need to define a serializer for comments.
<pre lang="ruby">
class CommentSerializer < ActiveModel::Serializer
attributes :id, :title, :body
# define any logic for dealing with authorization-based attributes here
end
class PostSerializer < ActiveModel::Serializer
attributes :title, :body
has_many :comments
def as_json
{ post: serializable_hash }.merge!(associations)
end
def serializable_hash
post_hash = attributes
post_hash.merge!(association_ids)
post_hash
end
private
def attributes
hash = super
hash.merge!(email: post.email) if super?
hash
end
def comments
post.comments_for(scope)
end
def super?
@scope.superuser?
end
end
</pre>
Here, we used two convenience methods: +associations+ and +association_ids+. The first,
+associations+, creates a hash of all of the define associations, using their defined
serializers. The second, +association_ids+, generates a hash whose key is the association
name and whose value is an Array of the association's keys.
The +association_ids+ helper will use the overridden version of the association, so in
this case, +association_ids+ will only include the ids of the comments provided by the
+comments+ method.
h3. Special Association Serializers
So far, associations defined in serializers use either the +as_json+ method on the model
or the defined serializer for the association type. Sometimes, you may want to serialize
associated models differently when they are requested as part of another resource than
when they are requested on their own.
For instance, we might want to provide the full comment when it is requested directly,
but only its title when requested as part of the post. To achieve this, you can define
a serializer for associated objects nested inside the main serializer.
<pre lang="ruby">
class PostSerializer < ActiveModel::Serializer
class CommentSerializer < ActiveModel::Serializer
attributes :id, :title
end
# same as before
# ...
end
</pre>
In other words, if a +PostSerializer+ is trying to serialize comments, it will first
look for +PostSerializer::CommentSerializer+ before falling back to +CommentSerializer+
and finally +comment.as_json+.
h3. Overriding the Defaults
h4. Authorization Scope
By default, the authorization scope for serializers is +:current_user+. This means
that when you call +render json: @post+, the controller will automatically call
its +current_user+ method and pass that along to the serializer's initializer.
If you want to change that behavior, simply use the +serialization_scope+ class
method.
<pre lang="ruby">
class PostsController < ApplicationController
serialization_scope :current_app
end
</pre>
You can also implement an instance method called (no surprise) +serialization_scope+,
which allows you to define a dynamic authorization scope based on the current request.
WARNING: If you use different objects as authorization scopes, make sure that they all implement whatever interface you use in your serializers to control what the outputted JSON looks like.
h3. Using Serializers Outside of a Request
The serialization API encapsulates the concern of generating a JSON representation of
a particular model for a particular user. As a result, you should be able to easily use
serializers, whether you define them yourself or whether you use +ActiveModel::Serializer+
outside a request.
For instance, if you want to generate the JSON representation of a post for a user outside
of a request:
<pre lang="ruby">
user = get_user # some logic to get the user in question
PostSerializer.new(post, user).to_json # reliably generate JSON output
</pre>
If you want to generate JSON for an anonymous user, you should be able to use whatever
technique you use in your application to generate anonymous users outside of a request.
Typically, that means creating a new user and not saving it to the database:
<pre lang="ruby">
user = User.new # create a new anonymous user
PostSerializer.new(post, user).to_json
</pre>
In general, the better you encapsulate your authorization logic, the more easily you
will be able to use the serializer outside of the context of a request. For instance,
if you use an authorization library like Cancan, which uses a uniform +user.can?(action, model)+,
the authorization interface can very easily be replaced by a plain Ruby object for
testing or usage outside the context of a request.
h3. Collections
So far, we've talked about serializing individual model objects. By default, Rails
will serialize collections, including when using the +associations+ helper, by
looping over each element of the collection, calling +serializable_hash+ on the element,
and then grouping them by their type (using the plural version of their class name
as the root).
For example, an Array of post objects would serialize as:
<pre lang="json">
{
posts: [
{
title: "FIRST POST!",
body: "It's my first pooooost"
},
{ title: "Second post!",
body: "Zomg I made it to my second post"
}
]
}
</pre>
If you want to change the behavior of serialized Arrays, you need to create
a custom Array serializer.
<pre lang="ruby">
class ArraySerializer < ActiveModel::ArraySerializer
def serializable_array
serializers.map do |serializer|
serializer.serializable_hash
end
end
def as_json
hash = { root => serializable_array }
hash.merge!(associations)
hash
end
end
</pre>
When generating embedded associations using the +associations+ helper inside a
regular serializer, it will create a new <code>ArraySerializer</code> with the
associated content and call its +serializable_array+ method. In this case, those
embedded associations will not recursively include associations.
When generating an Array using +render json: posts+, the controller will invoke
the +as_json+ method, which will include its associations and its root.

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Gemfile
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source 'https://rubygems.org'
# Specify gem dependencies in active_model_serializers.gemspec
gemspec
gem "coveralls", require: false

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Gemfile.edge
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source 'http://rubygems.org'
gemspec
gem 'rails', github: 'rails/rails'
# Current dependencies of edge rails
gem 'journey', github: 'rails/journey'
gem 'activerecord-deprecated_finders' , github: 'rails/activerecord-deprecated_finders'

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MIT-LICENSE.txt
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Copyright (c) 2011-2012 José Valim & Yehuda Katz
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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README.md
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[![Build Status](https://api.travis-ci.org/rails-api/active_model_serializers.png)](https://travis-ci.org/rails-api/active_model_serializers) [![Code Climate](https://codeclimate.com/github/rails-api/active_model_serializers.png)](https://codeclimate.com/github/rails-api/active_model_serializers) [![Coverage Status](https://coveralls.io/repos/rails-api/active_model_serializers/badge.png?branch=master)](https://coveralls.io/r/rails-api/active_model_serializers)
# Purpose
The purpose of `ActiveModel::Serializers` is to provide an object to
encapsulate serialization of `ActiveModel` objects, including `ActiveRecord`
objects.
Serializers know about both a model and the `current_user`, so you can
customize serialization based upon whether a user is authorized to see the
content.
In short, **serializers replace hash-driven development with object-oriented
development.**
# Installing
The easiest way to install `ActiveModel::Serializers` is to add it to your
`Gemfile`:
```ruby
gem "active_model_serializers"
```
Then, install it on the command line:
```
$ bundle install
```
#### Ruby 1.8 is no longer supported!
If you must use a ruby 1.8 version (MRI 1.8.7, REE, Rubinius 1.8, or JRuby 1.8), you need to use version 0.8.x.
Versions after 0.9.0 do not support ruby 1.8. To specify version 0.8, include this in your Gemfile:
```ruby
gem "active_model_serializers", "~> 0.8.0"
```
# Creating a Serializer
The easiest way to create a new serializer is to generate a new resource, which
will generate a serializer at the same time:
```
$ rails g resource post title:string body:string
```
This will generate a serializer in `app/serializers/post_serializer.rb` for
your new model. You can also generate a serializer for an existing model with
the serializer generator:
```
$ rails g serializer post
```
### Support for POROs and other ORMs.
Currently `ActiveModel::Serializers` adds serialization support to all models
that descend from `ActiveRecord` or include `Mongoid::Document`. If you are
using another ORM, or if you are using objects that are `ActiveModel`
compliant but do not descend from `ActiveRecord` or include
`Mongoid::Document`, you must add an include statement for
`ActiveModel::SerializerSupport` to make models serializable. If you
also want to make collections serializable, you should include
`ActiveModel::ArraySerializerSupport` into your ORM's
relation/criteria class.
# ActiveModel::Serializer
All new serializers descend from ActiveModel::Serializer
# render :json
In your controllers, when you use `render :json`, Rails will now first search
for a serializer for the object and use it if available.
```ruby
class PostsController < ApplicationController
def show
@post = Post.find(params[:id])
render json: @post
end
end
```
In this case, Rails will look for a serializer named `PostSerializer`, and if
it exists, use it to serialize the `Post`.
This also works with `respond_with`, which uses `to_json` under the hood. Also
note that any options passed to `render :json` will be passed to your
serializer and available as `@options` inside.
To specify a custom serializer for an object, there are 2 options:
#### 1. Specify the serializer in your model:
```ruby
class Post < ActiveRecord::Base
def active_model_serializer
FancyPostSerializer
end
end
```
#### 2. Specify the serializer when you render the object:
```ruby
render json: @post, serializer: FancyPostSerializer
```
## Arrays
In your controllers, when you use `render :json` for an array of objects, AMS will
use `ActiveModel::ArraySerializer` (included in this project) as the base serializer,
and the individual `Serializer` for the objects contained in that array.
```ruby
class PostSerializer < ActiveModel::Serializer
attributes :title, :body
end
class PostsController < ApplicationController
def index
@posts = Post.all
render json: @posts
end
end
```
Given the example above, the index action will return
```json
{
"posts":
[
{ "title": "Post 1", "body": "Hello!" },
{ "title": "Post 2", "body": "Goodbye!" }
]
}
```
By default, the root element is the name of the controller. For example, `PostsController`
generates a root element "posts". To change it:
```ruby
render json: @posts, root: "some_posts"
```
You may disable the root element for arrays at the top level, which will result in
more concise json. See the next section for ways on how to do this. Disabling the
root element of the array with any of those methods will produce
```json
[
{ "title": "Post 1", "body": "Hello!" },
{ "title": "Post 2", "body": "Goodbye!" }
]
```
To specify a custom serializer for the items within an array:
```ruby
render json: @posts, each_serializer: FancyPostSerializer
```
## Disabling the root element
You have 4 options to disable the root element, each with a slightly different scope:
#### 1. Disable root globally for all, or per class
In an initializer:
```ruby
ActiveSupport.on_load(:active_model_serializers) do
# Disable for all serializers (except ArraySerializer)
ActiveModel::Serializer.root = false
# Disable for ArraySerializer
ActiveModel::ArraySerializer.root = false
end
```
#### 2. Disable root per render call in your controller
```ruby
render json: @posts, root: false
```
#### 3. Subclass the serializer, and specify using it
```ruby
class CustomArraySerializer < ActiveModel::ArraySerializer
self.root = false
end
# controller:
render json: @posts, serializer: CustomArraySerializer
```
#### 4. Define default_serializer_options in your controller
If you define `default_serializer_options` method in your controller,
all serializers in actions of this controller and it's children will use them.
One of the options may be `root: false`
```ruby
def default_serializer_options
{
root: false
}
end
```
## Getting the old version
If you find that your project is already relying on the old rails to_json
change `render :json` to `render json: @your_object.to_json`.
# Attributes and Associations
Once you have a serializer, you can specify which attributes and associations
you would like to include in the serialized form.
```ruby
class PostSerializer < ActiveModel::Serializer
attributes :id, :title, :body
has_many :comments
end
```
## Attributes
For specified attributes, a serializer will look up the attribute on the
object you passed to `render :json`. It uses
`read_attribute_for_serialization`, which `ActiveRecord` objects implement as a
regular attribute lookup.
Before looking up the attribute on the object, a serializer will check for the
presence of a method with the name of the attribute. This allows serializers to
include properties beyond the simple attributes of the model. For example:
```ruby
class PersonSerializer < ActiveModel::Serializer
attributes :first_name, :last_name, :full_name
def full_name
"#{object.first_name} #{object.last_name}"
end
end
```
Within a serializer's methods, you can access the object being
serialized as `object`.
Since this shadows any attribute named `object`, you can include them through `object.object`. For example:
```ruby
class VersionSerializer < ActiveModel::Serializer
attribute :version_object, key: :object
def version_object
object.object
end
end
```
You can also access the `current_user` method, which provides an
authorization context to your serializer. By default, the context
is the current user of your application, but this
[can be customized](#customizing-scope).
Serializers will check for the presence of a method named
`include_[ATTRIBUTE]?` to determine whether a particular attribute should be
included in the output. This is typically used to customize output
based on `current_user`. For example:
```ruby
class PostSerializer < ActiveModel::Serializer
attributes :id, :title, :body, :author
def include_author?
current_user.admin?
end
end
```
The type of a computed attribute (like :full_name above) is not easily
calculated without some sophisticated static code analysis. To specify the
type of a computed attribute:
```ruby
class PersonSerializer < ActiveModel::Serializer
attributes :first_name, :last_name, {full_name: :string}
def full_name
"#{object.first_name} #{object.last_name}"
end
end
```
If you would like the key in the outputted JSON to be different from its name
in ActiveRecord, you can use the `:key` option to customize it:
```ruby
class PostSerializer < ActiveModel::Serializer
attributes :id, :body
# look up :subject on the model, but use +title+ in the JSON
attribute :subject, key: :title
has_many :comments
end
```
If you would like to add meta information to the outputted JSON, use the `:meta`
option:
```ruby
render json: @posts, serializer: CustomArraySerializer, meta: {total: 10}
```
The above usage of `:meta` will produce the following:
```json
{
"meta": { "total": 10 },
"posts": [
{ "title": "Post 1", "body": "Hello!" },
{ "title": "Post 2", "body": "Goodbye!" }
]
}
```
If you would like to change the meta key name you can use the `:meta_key` option:
```ruby
render json: @posts, serializer: CustomArraySerializer, meta: {total: 10}, meta_key: 'meta_object'
```
The above usage of `:meta_key` will produce the following:
```json
{
"meta_object": { "total": 10 },
"posts": [
{ "title": "Post 1", "body": "Hello!" },
{ "title": "Post 2", "body": "Goodbye!" }
]
}
```
If you would like direct, low-level control of attribute serialization, you can
completely override the `attributes` method to return the hash you need:
```ruby
class PersonSerializer < ActiveModel::Serializer
attributes :first_name, :last_name
def attributes
hash = super
if current_user.admin?
hash["ssn"] = object.ssn
hash["secret"] = object.mothers_maiden_name
end
hash
end
end
```
## Associations
For specified associations, the serializer will look up the association and
then serialize each element of the association. For instance, a `has_many
:comments` association will create a new `CommentSerializer` for each comment
and use it to serialize the comment.
By default, serializers simply look up the association on the original object.
You can customize this behavior by implementing a method with the name of the
association and returning a different Array. Often, you will do this to
customize the objects returned based on the current user.
```ruby
class PostSerializer < ActiveModel::Serializer
attributes :id, :title, :body
has_many :comments
# only let the user see comments he created.
def comments
object.comments.where(created_by: current_user)
end
end
```
As with attributes, you can change the JSON key that the serializer should
use for a particular association.
```ruby
class PostSerializer < ActiveModel::Serializer
attributes :id, :title, :body
# look up comments, but use +my_comments+ as the key in JSON
has_many :comments, key: :my_comments
end
```
Also, as with attributes, serializers will check for the presence
of a method named `include_[ASSOCIATION]?` to determine whether a particular association
should be included in the output. For example:
```ruby
class PostSerializer < ActiveModel::Serializer
attributes :id, :title, :body
has_many :comments
def include_comments?
!object.comments_disabled?
end
end
```
If you would like lower-level control of association serialization, you can
override `include_associations!` to specify which associations should be included:
```ruby
class PostSerializer < ActiveModel::Serializer
attributes :id, :title, :body
has_one :author
has_many :comments
def include_associations!
include! :author if current_user.admin?
include! :comments unless object.comments_disabled?
end
end
```
You may also use the `:serializer` option to specify a custom serializer class and the `:polymorphic` option to specify an association that is polymorphic (STI), e.g.:
```ruby
has_many :comments, serializer: CommentShortSerializer
has_one :reviewer, polymorphic: true
```
Serializers are only concerned with multiplicity, and not ownership. `belongs_to` ActiveRecord associations can be included using `has_one` in your serializer.
## Embedding Associations
By default, associations will be embedded inside the serialized object. So if
you have a post, the outputted JSON will look like:
```json
{
"post": {
"id": 1,
"title": "New post",
"body": "A body!",
"comments": [
{ "id": 1, "body": "what a dumb post" }
]
}
}
```
This is convenient for simple use-cases, but for more complex clients, it is
better to supply an Array of IDs for the association. This makes your API more
flexible from a performance standpoint and avoids wasteful duplication.
To embed IDs instead of associations, simply use the `embed` class method:
```ruby
class PostSerializer < ActiveModel::Serializer
embed :ids
attributes :id, :title, :body
has_many :comments
end
```
Now, any associations will be supplied as an Array of IDs:
```json
{
"post": {
"id": 1,
"title": "New post",
"body": "A body!",
"comment_ids": [ 1, 2, 3 ]
}
}
```
Alternatively, you can choose to embed only the ids or the associated objects per association:
```ruby
class PostSerializer < ActiveModel::Serializer
attributes :id, :title, :body
has_many :comments, embed: :objects
has_many :tags, embed: :ids
end
```
The JSON will look like this:
```json
{
"post": {
"id": 1,
"title": "New post",
"body": "A body!",
"comments": [
{ "id": 1, "body": "what a dumb post" }
],
"tag_ids": [ 1, 2, 3 ]
}
}
```
In addition to supplying an Array of IDs, you may want to side-load the data
alongside the main object. This makes it easier to process the entire package
of data without having to recursively scan the tree looking for embedded
information. It also ensures that associations that are shared between several
objects (like tags), are only delivered once for the entire payload.
You can specify that the data be included like this:
```ruby
class PostSerializer < ActiveModel::Serializer
embed :ids, include: true
attributes :id, :title, :body
has_many :comments
end
```
Assuming that the comments also `has_many :tags`, you will get a JSON like
this:
```json
{
"post": {
"id": 1,
"title": "New post",
"body": "A body!",
"comment_ids": [ 1, 2 ]
},
"comments": [
{ "id": 1, "body": "what a dumb post", "tag_ids": [ 1, 2 ] },
{ "id": 2, "body": "i liked it", "tag_ids": [ 1, 3 ] },
],
"tags": [
{ "id": 1, "name": "short" },
{ "id": 2, "name": "whiny" },
{ "id": 3, "name": "happy" }
]
}
```
You can also specify a different root for the embedded objects than the key
used to reference them:
```ruby
class PostSerializer < ActiveModel::Serializer
embed :ids, include: true
attributes :id, :title, :body
has_many :comments, key: :comment_ids, root: :comment_objects
end
```
This would generate JSON that would look like this:
```json
{
"post": {
"id": 1,
"title": "New post",
"body": "A body!",
"comment_ids": [ 1 ]
},
"comment_objects": [
{ "id": 1, "body": "what a dumb post" }
]
}
```
You can also specify a different attribute to use rather than the ID of the
objects:
```ruby
class PostSerializer < ActiveModel::Serializer
embed :ids, include: true
attributes :id, :title, :body
has_many :comments, embed_key: :external_id
end
```
This would generate JSON that would look like this:
```json
{
"post": {
"id": 1,
"title": "New post",
"body": "A body!",
"comment_ids": [ "COMM001" ]
},
"comments": [
{ "id": 1, "external_id": "COMM001", "body": "what a dumb post" }
]
}
```
**NOTE**: The `embed :ids` mechanism is primary useful for clients that process
data in bulk and load it into a local store. For these clients, the ability to
easily see all of the data per type, rather than having to recursively scan the
data looking for information, is extremely useful.
If you are mostly working with the data in simple scenarios and manually making
Ajax requests, you probably just want to use the default embedded behavior.
## Customizing Scope
In a serializer, `current_user` is the current authorization scope which the controller
provides to the serializer when you call `render :json`. By default, this is
`current_user`, but can be customized in your controller by calling
`serialization_scope`:
```ruby
class ApplicationController < ActionController::Base
serialization_scope :current_admin
end
```
The above example will also change the scope name from `current_user` to
`current_admin`.
Please note that, until now, `serialization_scope` doesn't accept a second
object with options for specifying which actions should or should not take a
given scope in consideration.
To be clear, it's not possible, yet, to do something like this:
```ruby
class SomeController < ApplicationController
serialization_scope :current_admin, except: [:index, :show]
end
```
So, in order to have a fine grained control of what each action should take in
consideration for its scope, you may use something like this:
```ruby
class CitiesController < ApplicationController
serialization_scope nil
def index
@cities = City.all
render json: @cities, each_serializer: CitySerializer
end
def show
@city = City.find(params[:id])
render json: @city, scope: current_admin, scope_name: :current_admin
end
end
```
Assuming that the `current_admin` method needs to make a query in the database
for the current user, the advantage of this approach is that, by setting
`serialization_scope` to `nil`, the `index` action no longer will need to make
that query, only the `show` action will.
## Caching
To cache a serializer, call `cached` and define a `cache_key` method:
```ruby
class PostSerializer < ActiveModel::Serializer
cached # enables caching for this serializer
attributes :title, :body
def cache_key
[object, current_user]
end
end
```
The caching interface uses `Rails.cache` under the hood.
# Design and Implementation
## Keep it Simple
ActiveModel::Serializers is capable of producing complex JSON views/large object
trees, and it may be tempting to design in this way so that your client can make
fewer requests to get data and so that related querying can be optimized.
However, keeping things simple in your serializers and controllers may
significantly reduce complexity and maintenance over the long-term development
of your application. Please consider reducing the complexity of the JSON views
you provide via the serializers as you build out your application, so that
controllers/services can be more easily reused without a lot of complexity
later.
## Performance
As you develop your controllers or other code that utilizes serializers, try to
avoid n+1 queries by ensuring that data loads in an optimal fashion, e.g. if you
are using ActiveRecord, you might want to use query includes or joins as needed
to make the data available that the serializer(s) need.

18
Rakefile
View File

@ -1,18 +0,0 @@
#!/usr/bin/env rake
require "bundler/gem_tasks"
require "rake/testtask"
desc 'Run tests'
Rake::TestTask.new(:test) do |t|
t.libs << 'lib'
t.libs << 'test'
t.pattern = 'test/**/*_test.rb'
t.verbose = true
end
desc 'Benchmark'
task :bench do
load 'bench/perf.rb'
end
task default: :test

28
active_model_serializers.gemspec
View File

@ -1,28 +0,0 @@
# -*- encoding: utf-8 -*-
$:.unshift File.expand_path("../lib", __FILE__)
require "active_model/serializer/version"
Gem::Specification.new do |gem|
gem.authors = ["José Valim", "Yehuda Katz"]
gem.email = ["jose.valim@gmail.com", "wycats@gmail.com"]
gem.description = %q{Making it easy to serialize models for client-side use}
gem.summary = %q{Bringing consistency and object orientation to model serialization. Works great for client-side MVC frameworks!}
gem.homepage = "https://github.com/rails-api/active_model_serializers"
gem.executables = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
gem.files = `git ls-files`.split("\n")
gem.test_files = `git ls-files -- {test,spec,features}/*`.split("\n")
gem.name = "active_model_serializers"
gem.require_paths = ["lib"]
gem.version = ActiveModel::Serializer::VERSION
gem.required_ruby_version = ">= 1.9.3"
gem.add_dependency "activemodel", ">= 3.2"
gem.add_development_dependency "rails", ">= 3.2"
gem.add_development_dependency "pry"
gem.add_development_dependency "simplecov"
gem.add_development_dependency "coveralls"
end

43
bench/perf.rb
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@ -1,43 +0,0 @@
require "rubygems"
require "bundler/setup"
require "active_model_serializers"
require "active_support/json"
require "benchmark"
class User < Struct.new(:id,:name,:age,:about)
include ActiveModel::SerializerSupport
def fast_hash
h = {
id: read_attribute_for_serialization(:id),
name: read_attribute_for_serialization(:name),
about: read_attribute_for_serialization(:about)
}
h[:age] = read_attribute_for_serialization(:age) if age > 18
h
end
end
class UserSerializer < ActiveModel::Serializer
attributes :id, :name, :age, :about
def include_age?
object.age > 18
end
end
u = User.new(1, "sam", 10, "about")
s = UserSerializer.new(u)
n = 100000
Benchmark.bmbm {|x|
x.report("init") { n.times { UserSerializer.new(u) } }
x.report("fast_hash") { n.times { u.fast_hash } }
x.report("attributes") { n.times { UserSerializer.new(u).attributes } }
x.report("serializable_hash") { n.times { UserSerializer.new(u).serializable_hash } }
}

19
cruft.md
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@ -1,19 +0,0 @@
As of Ruby 1.9.3, it is impossible to dynamically generate a Symbol
through interpolation without generating garbage. Theoretically, Ruby
should be able to take care of this by building up the String in C and
interning the C String.
Because of this, we avoid generating dynamic Symbols at runtime. For
example, instead of generating the instrumentation event dynamically, we
have a constant with a Hash of events:
```ruby
INSTRUMENT = {
serialize: :"serialize.serializer",
associations: :"associations.serializer"
}
```
If Ruby ever fixes this issue and avoids generating garbage with dynamic
symbols, this code can be removed.

58
lib/action_controller/serialization.rb
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@ -1,58 +0,0 @@
module ActionController
# Action Controller Serialization
#
# Overrides render :json to check if the given object implements +active_model_serializer+
# as a method. If so, use the returned serializer instead of calling +to_json+ on the object.
#
# This module also provides a serialization_scope method that allows you to configure the
# +serialization_scope+ of the serializer. Most apps will likely set the +serialization_scope+
# to the current user:
#
# class ApplicationController < ActionController::Base
# serialization_scope :current_user
# end
#
# If you need more complex scope rules, you can simply override the serialization_scope:
#
# class ApplicationController < ActionController::Base
# private
#
# def serialization_scope
# current_user
# end
# end
#
module Serialization
extend ActiveSupport::Concern
include ActionController::Renderers
included do
class_attribute :_serialization_scope
self._serialization_scope = :current_user
end
def serialization_scope
send(_serialization_scope) if _serialization_scope && respond_to?(_serialization_scope, true)
end
def default_serializer_options
end
def _render_option_json(resource, options)
json = ActiveModel::Serializer.build_json(self, resource, options)
if json
super(json, options)
else
super
end
end
module ClassMethods
def serialization_scope(scope)
self._serialization_scope = scope
end
end
end
end

65
lib/active_model/array_serializer.rb
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@ -1,65 +0,0 @@
require 'active_model/serializable'
require 'active_model/serializer/caching'
require "active_support/core_ext/class/attribute"
require 'active_support/dependencies'
require 'active_support/descendants_tracker'
module ActiveModel
# Active Model Array Serializer
#
# Serializes an Array, checking if each element implements
# the +active_model_serializer+ method.
#
# To disable serialization of root elements:
#
# ActiveModel::ArraySerializer.root = false
#
class ArraySerializer
extend ActiveSupport::DescendantsTracker
include ActiveModel::Serializable
include ActiveModel::Serializer::Caching
attr_reader :object, :options
class_attribute :root
class_attribute :cache
class_attribute :perform_caching
class << self
# set perform caching like root
def cached(value = true)
self.perform_caching = value
end
end
def initialize(object, options={})
@object = object
@options = options
end
def serialize_object
serializable_array
end
def serializable_array
object.map do |item|
if options.has_key? :each_serializer
serializer = options[:each_serializer]
elsif item.respond_to?(:active_model_serializer)
serializer = item.active_model_serializer
end
serializer ||= DefaultSerializer
serializable = serializer.new(item, options.merge(root: nil))
if serializable.respond_to?(:serializable_hash)
serializable.serializable_hash
else
serializable.as_json
end
end
end
end
end

49
lib/active_model/serializable.rb
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@ -1,49 +0,0 @@
require 'active_support/core_ext/object/to_json'
module ActiveModel
# Enable classes to Classes including this module to serialize themselves by implementing a serialize method and an options method.
#
# Example:
#
# require 'active_model_serializers'
#
# class MySerializer
# include ActiveModel::Serializable
#
# def initialize
# @options = {}
# end
#
# attr_reader :options
#
# def serialize
# { a: 1 }
# end
# end
#
# puts MySerializer.new.to_json
module Serializable
def as_json(args={})
if root = args[:root] || options[:root]
options[:hash] = hash = {}
options[:unique_values] = {}
hash.merge!(root => serialize)
include_meta hash
hash
else
serialize
end
end
private
def include_meta(hash)
hash[meta_key] = options[:meta] if options.has_key?(:meta)
end
def meta_key
options[:meta_key].try(:to_sym) || :meta
end
end
end

475
lib/active_model/serializer.rb
View File

@ -1,475 +0,0 @@
require 'active_model/serializable'
require 'active_model/serializer/caching'
require "active_support/core_ext/class/attribute"
require "active_support/core_ext/module/anonymous"
require 'active_support/dependencies'
require 'active_support/descendants_tracker'
module ActiveModel
# Active Model Serializer
#
# Provides a basic serializer implementation that allows you to easily
# control how a given object is going to be serialized. On initialization,
# it expects two objects as arguments, a resource and options. For example,
# one may do in a controller:
#
# PostSerializer.new(@post, scope: current_user).to_json
#
# The object to be serialized is the +@post+ and the current user is passed
# in for authorization purposes.
#
# We use the scope to check if a given attribute should be serialized or not.
# For example, some attributes may only be returned if +current_user+ is the
# author of the post:
#
# class PostSerializer < ActiveModel::Serializer
# attributes :title, :body
# has_many :comments
#
# private
#
# def attributes
# hash = super
# hash.merge!(email: post.email) if author?
# hash
# end
#
# def author?
# post.author == scope
# end
# end
#
class Serializer
extend ActiveSupport::DescendantsTracker
include ActiveModel::Serializable
include ActiveModel::Serializer::Caching
INCLUDE_METHODS = {}
INSTRUMENT = { serialize: :"serialize.serializer", associations: :"associations.serializer" }
class IncludeError < StandardError
attr_reader :source, :association
def initialize(source, association)
@source, @association = source, association
end
def to_s
"Cannot serialize #{association} when #{source} does not have a root!"
end
end
class_attribute :_attributes
self._attributes = {}
class_attribute :_associations
self._associations = {}
class_attribute :_root
class_attribute :_embed
self._embed = :objects
class_attribute :_root_embed
class_attribute :cache
class_attribute :perform_caching
class << self
def cached(value = true)
self.perform_caching = value
end
# Define attributes to be used in the serialization.
def attributes(*attrs)
self._attributes = _attributes.dup
attrs.each do |attr|
if Hash === attr
attr.each {|attr_real, key| attribute(attr_real, key: key) }
else
attribute attr
end
end
end
def attribute(attr, options={})
self._attributes = _attributes.merge(attr.is_a?(Hash) ? attr : {attr => options[:key] || attr.to_s.gsub(/\?$/, '').to_sym})
attr = attr.keys[0] if attr.is_a? Hash
unless method_defined?(attr)
define_method attr do
object.read_attribute_for_serialization(attr.to_sym)
end
end
define_include_method attr
# protect inheritance chains and open classes
# if a serializer inherits from another OR
# attributes are added later in a classes lifecycle
# poison the cache
define_method :_fast_attributes do
raise NameError
end
end
def associate(klass, attrs) #:nodoc:
options = attrs.extract_options!
self._associations = _associations.dup
attrs.each do |attr|
unless method_defined?(attr)
define_method attr do
object.send attr
end
end
define_include_method attr
self._associations[attr] = [klass, options]
end
end
def define_include_method(name)
method = "include_#{name}?".to_sym
INCLUDE_METHODS[name] = method
unless method_defined?(method)
define_method method do
true
end
end
end
# Defines an association in the object should be rendered.
#
# The serializer object should implement the association name
# as a method which should return an array when invoked. If a method
# with the association name does not exist, the association name is
# dispatched to the serialized object.
def has_many(*attrs)
associate(Association::HasMany, attrs)
end
# Defines an association in the object should be rendered.
#
# The serializer object should implement the association name
# as a method which should return an object when invoked. If a method
# with the association name does not exist, the association name is
# dispatched to the serialized object.
def has_one(*attrs)
associate(Association::HasOne, attrs)
end
# Return a schema hash for the current serializer. This information
# can be used to generate clients for the serialized output.
#
# The schema hash has two keys: +attributes+ and +associations+.
#
# The +attributes+ hash looks like this:
#
# { name: :string, age: :integer }
#
# The +associations+ hash looks like this:
# { posts: { has_many: :posts } }
#
# If :key is used:
#
# class PostsSerializer < ActiveModel::Serializer
# has_many :posts, key: :my_posts
# end
#
# the hash looks like this:
#
# { my_posts: { has_many: :posts }
#
# This information is extracted from the serializer's model class,
# which is provided by +SerializerClass.model_class+.
#
# The schema method uses the +columns_hash+ and +reflect_on_association+
# methods, provided by default by ActiveRecord. You can implement these
# methods on your custom models if you want the serializer's schema method
# to work.
#
# TODO: This is currently coupled to Active Record. We need to
# figure out a way to decouple those two.
def schema
klass = model_class
columns = klass.columns_hash
attrs = {}
_attributes.each do |name, key|
if column = columns[name.to_s]
attrs[key] = column.type
else
# Computed attribute (method on serializer or model). We cannot
# infer the type, so we put nil, unless specified in the attribute declaration
if name != key
attrs[name] = key
else
attrs[key] = nil
end
end
end
associations = {}
_associations.each do |attr, (association_class, options)|
association = association_class.new(attr, options)
if model_association = klass.reflect_on_association(association.name)
# Real association.
associations[association.key] = { model_association.macro => model_association.name }
else
# Computed association. We could infer has_many vs. has_one from
# the association class, but that would make it different from
# real associations, which read has_one vs. belongs_to from the
# model.
associations[association.key] = nil
end
end
{ attributes: attrs, associations: associations }
end
# The model class associated with this serializer.
def model_class
name.sub(/Serializer$/, '').constantize
end
# Define how associations should be embedded.
#
# embed :objects # Embed associations as full objects
# embed :ids # Embed only the association ids
# embed :ids, include: true # Embed the association ids and include objects in the root
#
def embed(type, options={})
self._embed = type
self._root_embed = true if options[:include]
end
# Defines the root used on serialization. If false, disables the root.
def root(name)
self._root = name
end
alias_method :root=, :root
# Used internally to create a new serializer object based on controller
# settings and options for a given resource. These settings are typically
# set during the request lifecycle or by the controller class, and should
# not be manually defined for this method.
def build_json(controller, resource, options)
default_options = controller.send(:default_serializer_options) || {}
options = default_options.merge(options || {})
serializer = options.delete(:serializer) ||
(resource.respond_to?(:active_model_serializer) &&
resource.active_model_serializer)
return serializer unless serializer
if resource.respond_to?(:to_ary)
unless serializer <= ActiveModel::ArraySerializer
raise ArgumentError.new("#{serializer.name} is not an ArraySerializer. " +
"You may want to use the :each_serializer option instead.")
end
if options[:root] != false && serializer.root != false
# the serializer for an Array is ActiveModel::ArraySerializer
options[:root] ||= serializer.root || controller.controller_name
end
end
options[:scope] = controller.serialization_scope unless options.has_key?(:scope)
options[:scope_name] = controller._serialization_scope unless options.has_key?(:scope_name)
options[:url_options] = controller.url_options
serializer.new(resource, options)
end
end
attr_reader :object, :options
def initialize(object, options={})
@object, @options = object, options
scope_name = @options[:scope_name]
if scope_name && !respond_to?(scope_name)
self.class.class_eval do
define_method scope_name, lambda { scope }
end
end
end
def root_name
return false if self._root == false
class_name = self.class.name.demodulize.underscore.sub(/_serializer$/, '').to_sym unless self.class.name.blank?
if self._root == true
class_name
else
self._root || class_name
end
end
def url_options
@options[:url_options] || {}
end
# Returns a json representation of the serializable
# object including the root.
def as_json(args={})
super(root: args.fetch(:root, options.fetch(:root, root_name)))
end
def serialize_object
serializable_hash
end
# Returns a hash representation of the serializable
# object without the root.
def serializable_hash
return nil if @object.nil?
@node = attributes
include_associations! if _embed
@node
end
def include_associations!
_associations.each_key do |name|
include!(name) if include?(name)
end
end
def include?(name)
return false if @options.key?(:only) && !Array(@options[:only]).include?(name)
return false if @options.key?(:except) && Array(@options[:except]).include?(name)
send INCLUDE_METHODS[name]
end
def include!(name, options={})
hash = @options[:hash]
unique_values = @options[:unique_values] ||= {}
node = options[:node] ||= @node
value = options[:value]
if options[:include] == nil
if @options.key?(:include)
options[:include] = @options[:include].include?(name)
elsif @options.include?(:exclude)
options[:include] = !@options[:exclude].include?(name)
end
end
klass, klass_options = _associations[name]
association_class =
if klass
options = klass_options.merge options
klass
elsif value.respond_to?(:to_ary)
Association::HasMany
else
Association::HasOne
end
options = default_embed_options.merge!(options)
options[:value] ||= send(name)
association = association_class.new(name, options, self.options)
if association.embed_ids?
node[association.key] = association.serialize_ids
if association.embed_in_root? && hash.nil?
raise IncludeError.new(self.class, association.name)
elsif association.embed_in_root? && association.embeddable?
merge_association hash, association.root, association.serializables, unique_values
end
elsif association.embed_objects?
node[association.key] = association.serialize
end
end
# In some cases, an Array of associations is built by merging the associated
# content for all of the children. For instance, if a Post has_many comments,
# which has_many tags, the top-level :tags key will contain the merged list
# of all tags for all comments of the post.
#
# In order to make this efficient, we store a :unique_values hash containing
# a unique list of all of the objects that are already in the Array. This
# avoids the need to scan through the Array looking for entries every time
# we want to merge a new list of values.
def merge_association(hash, key, serializables, unique_values)
already_serialized = (unique_values[key] ||= {})
serializable_hashes = (hash[key] ||= [])
serializables.each do |serializable|
unless already_serialized.include? serializable.object
already_serialized[serializable.object] = true
serializable_hashes << serializable.serializable_hash
end
end
end
# Returns a hash representation of the serializable
# object attributes.
def attributes
_fast_attributes
rescue NameError
method = "def _fast_attributes\n"
method << " h = {}\n"
_attributes.each do |name,key|
method << " h[:\"#{key}\"] = read_attribute_for_serialization(:\"#{name}\") if include?(:\"#{name}\")\n"
end
method << " h\nend"
self.class.class_eval method
_fast_attributes
end
# Returns options[:scope]
def scope
@options[:scope]
end
alias :read_attribute_for_serialization :send
# Use ActiveSupport::Notifications to send events to external systems.
# The event name is: name.class_name.serializer
def instrument(name, payload = {}, &block)
event_name = INSTRUMENT[name]
ActiveSupport::Notifications.instrument(event_name, payload, &block)
end
private
def default_embed_options
{
embed: _embed,
include: _root_embed
}
end
end
# DefaultSerializer
#
# Provides a constant interface for all items, particularly
# for ArraySerializer.
class DefaultSerializer
attr_reader :object, :options
def initialize(object, options={})
@object, @options = object, options
end
def serializable_hash
@object.as_json(@options)
end
end
end

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lib/active_model/serializer/associations.rb
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module ActiveModel
class Serializer
class Association #:nodoc:
# name: The name of the association.
#
# options: A hash. These keys are accepted:
#
# value: The object we're associating with.
#
# serializer: The class used to serialize the association.
#
# embed: Define how associations should be embedded.
# - :objects # Embed associations as full objects.
# - :ids # Embed only the association ids.
# - :ids, include: true # Embed the association ids and include objects in the root.
#
# include: Used in conjunction with embed :ids. Includes the objects in the root.
#
# root: Used in conjunction with include: true. Defines the key used to embed the objects.
#
# key: Key name used to store the ids in.
#
# embed_key: Method used to fetch ids. Defaults to :id.
#
# polymorphic: Is the association is polymorphic?. Values: true or false.
def initialize(name, options={}, serializer_options={})
@name = name
@object = options[:value]
embed = options[:embed]
@embed_ids = embed == :id || embed == :ids
@embed_objects = embed == :object || embed == :objects
@embed_key = options[:embed_key] || :id
@embed_in_root = options[:include]
serializer = options[:serializer]
@serializer_class = serializer.is_a?(String) ? serializer.constantize : serializer
@options = options
@serializer_options = serializer_options
end
attr_reader :object, :root, :name, :embed_ids, :embed_objects, :embed_in_root
alias embeddable? object
alias embed_objects? embed_objects
alias embed_ids? embed_ids
alias use_id_key? embed_ids?
alias embed_in_root? embed_in_root
def key
if key = options[:key]
key
elsif use_id_key?
id_key
else
name
end
end
private
attr_reader :embed_key, :serializer_class, :options, :serializer_options
def find_serializable(object)
if serializer_class
serializer_class.new(object, serializer_options)
elsif object.respond_to?(:active_model_serializer) && (ams = object.active_model_serializer)
ams.new(object, serializer_options)
else
object
end
end
class HasMany < Association #:nodoc:
def root
options[:root] || name
end
def id_key
"#{name.to_s.singularize}_ids".to_sym
end
def serializables
object.map do |item|
find_serializable(item)
end
end
def serialize
object.map do |item|
find_serializable(item).serializable_hash
end
end
def serialize_ids
object.map do |item|
serializer = find_serializable(item)
if serializer.respond_to?(embed_key)
serializer.send(embed_key)
else
item.read_attribute_for_serialization(embed_key)
end
end
end
end
class HasOne < Association #:nodoc:
def initialize(name, options={}, serializer_options={})
super
@polymorphic = options[:polymorphic]
end
def root
if root = options[:root]
root
elsif polymorphic?
object.class.to_s.pluralize.demodulize.underscore.to_sym
else
name.to_s.pluralize.to_sym
end
end
def id_key
"#{name}_id".to_sym
end
def embeddable?
super || !polymorphic?
end
def serializables
value = object && find_serializable(object)
value ? [value] : []
end
def serialize
if object
if polymorphic?
{
:type => polymorphic_key,
polymorphic_key => find_serializable(object).serializable_hash
}
else
find_serializable(object).serializable_hash
end
end
end
def serialize_ids
if object
serializer = find_serializable(object)
id =
if serializer.respond_to?(embed_key)
serializer.send(embed_key)
else
object.read_attribute_for_serialization(embed_key)
end
if polymorphic?
{
type: polymorphic_key,
id: id
}
else
id
end
end
end
private
attr_reader :polymorphic
alias polymorphic? polymorphic
def use_id_key?
embed_ids? && !polymorphic?
end
def polymorphic_key
object.class.to_s.demodulize.underscore.to_sym
end
end
end
end
end

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lib/active_model/serializer/caching.rb
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module ActiveModel
class Serializer
module Caching
def to_json(*args)
if caching_enabled?
key = expand_cache_key([self.class.to_s.underscore, cache_key, 'to-json'])
cache.fetch key do
super
end
else
super
end
end
def serialize(*args)
if caching_enabled?
key = expand_cache_key([self.class.to_s.underscore, cache_key, 'serialize'])
cache.fetch key do
serialize_object
end
else
serialize_object
end
end
private
def caching_enabled?
perform_caching && cache && respond_to?(:cache_key)
end
def expand_cache_key(*args)
ActiveSupport::Cache.expand_cache_key(args)
end
end
end
end

5
lib/active_model/serializer/version.rb
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@ -1,5 +0,0 @@
module ActiveModel
class Serializer
VERSION = "0.8.1"
end
end

95
lib/active_model_serializers.rb
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require "active_support"
require "active_support/core_ext/string/inflections"
require "active_support/notifications"
require "active_model"
require "active_model/array_serializer"
require "active_model/serializer"
require "active_model/serializer/associations"
require "set"
if defined?(Rails)
module ActiveModel
class Railtie < Rails::Railtie
generators do |app|
Rails::Generators.configure!(app.config.generators)
Rails::Generators.hidden_namespaces.uniq!
require_relative "generators/resource_override"
end
initializer "include_routes.active_model_serializer" do |app|
ActiveSupport.on_load(:active_model_serializers) do
include AbstractController::UrlFor
extend ::AbstractController::Railties::RoutesHelpers.with(app.routes)
include app.routes.mounted_helpers
end
end
initializer "caching.active_model_serializer" do |app|
ActiveModel::Serializer.perform_caching = app.config.action_controller.perform_caching
ActiveModel::ArraySerializer.perform_caching = app.config.action_controller.perform_caching
ActiveModel::Serializer.cache = Rails.cache
ActiveModel::ArraySerializer.cache = Rails.cache
end
end
end
end
module ActiveModel::SerializerSupport
extend ActiveSupport::Concern
module ClassMethods #:nodoc:
if "".respond_to?(:safe_constantize)
def active_model_serializer
"#{self.name}Serializer".safe_constantize
end
else
def active_model_serializer
begin
"#{self.name}Serializer".constantize
rescue NameError => e
raise unless e.message =~ /uninitialized constant/
end
end
end
end
# Returns a model serializer for this object considering its namespace.
def active_model_serializer
self.class.active_model_serializer
end
alias :read_attribute_for_serialization :send
end
module ActiveModel::ArraySerializerSupport
def active_model_serializer
ActiveModel::ArraySerializer
end
end
Array.send(:include, ActiveModel::ArraySerializerSupport)
Set.send(:include, ActiveModel::ArraySerializerSupport)
{
active_record: 'ActiveRecord::Relation',
mongoid: 'Mongoid::Criteria'
}.each do |orm, rel_class|
ActiveSupport.on_load(orm) do
include ActiveModel::SerializerSupport
rel_class.constantize.send(:include, ActiveModel::ArraySerializerSupport)
end
end
begin
require 'action_controller'
require 'action_controller/serialization'
ActiveSupport.on_load(:action_controller) do
include ::ActionController::Serialization
end
rescue LoadError => ex
# rails on installed, continuing
end
ActiveSupport.run_load_hooks(:active_model_serializers, ActiveModel::Serializer)

16
lib/active_record/serializer_override.rb
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@ -1,16 +0,0 @@
# We do not recommend that you use AM::S in this way, but if you must, here
# is a mixin that overrides ActiveRecord::Base#to_json and #as_json.
module ActiveRecord
module SerializerOverride
def to_json options = {}
active_model_serializer.new(self).to_json options
end
def as_json options={}
active_model_serializer.new(self).as_json options
end
end
Base.send(:include, SerializerOverride)
end

13
lib/generators/resource_override.rb
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@ -1,13 +0,0 @@
require "rails/generators"
require "rails/generators/rails/resource/resource_generator"
module Rails
module Generators
ResourceGenerator.class_eval do
def add_serializer
invoke "serializer"
end
end
end
end

9
lib/generators/serializer/USAGE
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@ -1,9 +0,0 @@
Description:
Generates a serializer for the given resource with tests.
Example:
`rails generate serializer Account name created_at`
For TestUnit it creates:
Serializer: app/serializers/account_serializer.rb
TestUnit: test/unit/account_serializer_test.rb

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lib/generators/serializer/serializer_generator.rb
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module Rails
module Generators
class SerializerGenerator < NamedBase
source_root File.expand_path("../templates", __FILE__)
check_class_collision suffix: "Serializer"
argument :attributes, type: :array, default: [], banner: "field:type field:type"
class_option :parent, type: :string, desc: "The parent class for the generated serializer"
def create_serializer_file
template 'serializer.rb', File.join('app/serializers', class_path, "#{file_name}_serializer.rb")
end
private
def attributes_names
[:id] + attributes.select { |attr| !attr.reference? }.map { |a| a.name.to_sym }
end
def association_names
attributes.select { |attr| attr.reference? }.map { |a| a.name.to_sym }
end
def parent_class_name
if options[:parent]
options[:parent]
elsif defined?(::ApplicationSerializer)
"ApplicationSerializer"
else
"ActiveModel::Serializer"
end
end
end
end
end

8
lib/generators/serializer/templates/serializer.rb
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@ -1,8 +0,0 @@
<% module_namespacing do -%>
class <%= class_name %>Serializer < <%= parent_class_name %>
attributes <%= attributes_names.map(&:inspect).join(", ") %>
<% association_names.each do |attribute| -%>
has_one :<%= attribute %>
<% end -%>
end
<% end -%>

85
test/array_serializer_test.rb
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require "test_helper"
require "test_fakes"
class ArraySerializerTest < ActiveModel::TestCase
# serialize different typed objects
def test_array_serializer
model = Model.new
user = User.new
comments = Comment.new(title: "Comment1", id: 1)
array = [model, user, comments]
serializer = array.active_model_serializer.new(array, scope: { scope: true })
assert_equal([
{ model: "Model" },
{ last_name: "Valim", ok: true, first_name: "Jose", scope: true },
{ title: "Comment1" }
], serializer.as_json)
end
def test_array_serializer_with_root
comment1 = Comment.new(title: "Comment1", id: 1)
comment2 = Comment.new(title: "Comment2", id: 2)
array = [ comment1, comment2 ]
serializer = array.active_model_serializer.new(array, root: :comments)
assert_equal({ comments: [
{ title: "Comment1" },
{ title: "Comment2" }
]}, serializer.as_json)
end
def test_active_model_with_root
comment1 = ModelWithActiveModelSerializer.new(title: "Comment1")
comment2 = ModelWithActiveModelSerializer.new(title: "Comment2")
array = [ comment1, comment2 ]
serializer = array.active_model_serializer.new(array, root: :comments)
assert_equal({ comments: [
{ title: "Comment1" },
{ title: "Comment2" }
]}, serializer.as_json)
end
def test_array_serializer_with_hash
hash = { value: "something" }
array = [hash]
serializer = array.active_model_serializer.new(array, root: :items)
assert_equal({ items: [hash.as_json] }, serializer.as_json)
end
def test_array_serializer_with_specified_serializer
post1 = Post.new(title: "Post1", author: "Author1", id: 1)
post2 = Post.new(title: "Post2", author: "Author2", id: 2)
array = [ post1, post2 ]
serializer = array.active_model_serializer.new array, each_serializer: CustomPostSerializer
assert_equal([
{ title: "Post1" },
{ title: "Post2" }
], serializer.as_json)
end
def test_array_serializer_using_default_serializer
hash = { "value" => "something" }
class << hash
def active_model_serializer
nil
end
end
array = [hash]
serializer = array.active_model_serializer.new array
assert_equal([
{ "value" => "something" }
], serializer.as_json)
end
end

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test/association_test.rb
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require "test_helper"
class AssociationTest < ActiveModel::TestCase
def def_serializer(&block)
Class.new(ActiveModel::Serializer, &block)
end
class Model
def initialize(hash={})
@attributes = hash
end
def read_attribute_for_serialization(name)
@attributes[name]
end
def as_json(*)
{ model: "Model" }
end
def method_missing(meth, *args)
if meth.to_s =~ /^(.*)=$/
@attributes[$1.to_sym] = args[0]
elsif @attributes.key?(meth)
@attributes[meth]
else
super
end
end
end
def setup
@hash = {}
@root_hash = {}
@post = Model.new(title: "New Post", body: "Body")
@comment = Model.new(id: 1, external_id: "COMM001", body: "ZOMG A COMMENT")
@post.comments = [ @comment ]
@post.comment = @comment
@comment_serializer_class = def_serializer do
attributes :id, :external_id, :body
end
@post_serializer_class = def_serializer do
attributes :title, :body
end
@post_serializer = @post_serializer_class.new(@post, hash: @root_hash)
end
def include!(key, options={})
@post_serializer.include! key, {
embed: :ids,
include: true,
node: @hash,
serializer: @comment_serializer_class
}.merge(options)
end
def include_bare!(key, options={})
@post_serializer.include! key, {
node: @hash,
serializer: @comment_serializer_class
}.merge(options)
end
class NoDefaults < AssociationTest
def test_include_bang_has_many_associations
include! :comments, value: @post.comments
assert_equal({
comment_ids: [ 1 ]
}, @hash)
assert_equal({
comments: [
{ id: 1, external_id: "COMM001", body: "ZOMG A COMMENT" }
]
}, @root_hash)
end
def test_include_bang_with_embed_false
include! :comments, value: @post.comments, embed: false
assert_equal({}, @hash)
assert_equal({}, @root_hash)
end
def test_include_bang_with_embed_ids_include_false
include! :comments, value: @post.comments, embed: :ids, include: false
assert_equal({
comment_ids: [ 1 ]
}, @hash)
assert_equal({}, @root_hash)
end
def test_include_bang_has_one_associations
include! :comment, value: @post.comment
assert_equal({
comment_id: 1
}, @hash)
assert_equal({
comments: [{ id: 1, external_id: "COMM001", body: "ZOMG A COMMENT" }]
}, @root_hash)
end
end
class DefaultsTest < AssociationTest
def test_with_default_has_many
@post_serializer_class.class_eval do
has_many :comments
end
include! :comments
assert_equal({
comment_ids: [ 1 ]
}, @hash)
assert_equal({
comments: [
{ id: 1, external_id: "COMM001", body: "ZOMG A COMMENT" }
]
}, @root_hash)
end
def test_with_default_has_one
@post_serializer_class.class_eval do
has_one :comment
end
include! :comment
assert_equal({
comment_id: 1
}, @hash)
assert_equal({
comments: [
{ id: 1, external_id: "COMM001", body: "ZOMG A COMMENT" }
]
}, @root_hash)
end
def test_with_default_has_many_with_custom_key
@post_serializer_class.class_eval do
has_many :comments, key: :custom_comments
end
include! :comments
assert_equal({
custom_comments: [ 1 ]
}, @hash)
assert_equal({
comments: [
{ id: 1, external_id: "COMM001", body: "ZOMG A COMMENT" }
]
}, @root_hash)
end
def test_with_default_has_one_with_custom_key
@post_serializer_class.class_eval do
has_one :comment, key: :custom_comment_id
end
include! :comment
assert_equal({
custom_comment_id: 1
}, @hash)
assert_equal({
comments: [
{ id: 1, external_id: "COMM001", body: "ZOMG A COMMENT" }
]
}, @root_hash)
end
def test_with_default_has_many_with_custom_embed_key
@post_serializer_class.class_eval do
has_many :comments, embed_key: :external_id
end
include! :comments
assert_equal({
comment_ids: [ "COMM001" ]
}, @hash)
assert_equal({
comments: [
{ id: 1, external_id: "COMM001", body: "ZOMG A COMMENT" }
]
}, @root_hash)
end
def test_with_default_has_one_with_custom_embed_key
@post_serializer_class.class_eval do
has_one :comment, embed_key: :external_id
end
include! :comment
assert_equal({
comment_id: "COMM001"
}, @hash)
assert_equal({
comments: [
{ id: 1, external_id: "COMM001", body: "ZOMG A COMMENT" }
]
}, @root_hash)
end
def test_with_default_has_many_with_custom_key_and_custom_embed_key
@post_serializer_class.class_eval do
has_many :comments, key: :custom_comments, embed_key: :external_id
end
include! :comments
assert_equal({
custom_comments: [ "COMM001" ]
}, @hash)
assert_equal({
comments: [
{ id: 1, external_id: "COMM001", body: "ZOMG A COMMENT" }
]
}, @root_hash)
end
def test_with_default_has_one_with_custom_key_and_custom_embed_key
@post_serializer_class.class_eval do
has_one :comment, key: :custom_comment, embed_key: :external_id
end
include! :comment
assert_equal({
custom_comment: "COMM001"
}, @hash)
assert_equal({
comments: [
{ id: 1, external_id: "COMM001", body: "ZOMG A COMMENT" }
]
}, @root_hash)
end
def test_embed_objects_for_has_many_associations
@post_serializer_class.class_eval do
has_many :comments, embed: :objects
end
include_bare! :comments
assert_equal({
comments: [
{ id: 1, external_id: "COMM001", body: "ZOMG A COMMENT" }
]
}, @hash)
assert_equal({}, @root_hash)
end
def test_embed_ids_for_has_many_associations
@post_serializer_class.class_eval do
has_many :comments, embed: :ids
end
include_bare! :comments
assert_equal({
comment_ids: [ 1 ]
}, @hash)
assert_equal({}, @root_hash)
end
def test_embed_false_for_has_many_associations
@post_serializer_class.class_eval do
has_many :comments, embed: false
end
include_bare! :comments
assert_equal({}, @hash)
assert_equal({}, @root_hash)
end
def test_embed_ids_include_true_for_has_many_associations
@post_serializer_class.class_eval do
has_many :comments, embed: :ids, include: true
end
include_bare! :comments
assert_equal({
comment_ids: [ 1 ]
}, @hash)
assert_equal({
comments: [
{ id: 1, external_id: "COMM001", body: "ZOMG A COMMENT" }
]
}, @root_hash)
end
def test_embed_ids_for_has_one_associations
@post_serializer_class.class_eval do
has_one :comment, embed: :ids
end
include_bare! :comment
assert_equal({
comment_id: 1
}, @hash)
assert_equal({}, @root_hash)
end
def test_embed_false_for_has_one_associations
@post_serializer_class.class_eval do
has_one :comment, embed: false
end
include_bare! :comment
assert_equal({}, @hash)
assert_equal({}, @root_hash)
end
def test_embed_ids_include_true_for_has_one_associations
@post_serializer_class.class_eval do
has_one :comment, embed: :ids, include: true
end
include_bare! :comment
assert_equal({
comment_id: 1
}, @hash)
assert_equal({
comments: [
{ id: 1, external_id: "COMM001", body: "ZOMG A COMMENT" }
]
}, @root_hash)
end
def test_embed_ids_include_true_does_not_serialize_multiple_times
@post.recent_comment = @comment
@post_serializer_class.class_eval do
has_one :comment, embed: :ids, include: true
has_one :recent_comment, embed: :ids, include: true, root: :comments
end
# Count how often the @comment record is serialized.
serialized_times = 0
@comment.class_eval do
define_method :read_attribute_for_serialization, lambda { |name|
serialized_times += 1 if name == :body
super(name)
}
end
include_bare! :comment
include_bare! :recent_comment
assert_equal 1, serialized_times
end
def test_include_with_read_association_id_for_serialization_hook
@post_serializer_class.class_eval do
has_one :comment, embed: :ids, include: true
end
association_name = nil
@post.class_eval do
define_method :read_attribute_for_serialization, lambda { |name|
association_name = name
send(name)
}
define_method :comment_id, lambda {
@attributes[:comment].id
}
end
include_bare! :comment
assert_equal({
comment_id: 1
}, @hash)
end
def test_include_with_read_association_ids_for_serialization_hook
@post_serializer_class.class_eval do
has_many :comments, embed: :ids, include: false
end
association_name = nil
@post.class_eval do
define_method :read_attribute_for_serialization, lambda { |name|
association_name = name
send(name)
}
define_method :comment_ids, lambda {
@attributes[:comments].map(&:id)
}
end
include_bare! :comments
assert_equal({
comment_ids: [1]
}, @hash)
end
end
class RecursiveTest < AssociationTest
class BarSerializer < ActiveModel::Serializer; end
class FooSerializer < ActiveModel::Serializer
root :foos
attributes :id
has_many :bars, serializer: BarSerializer, root: :bars, embed: :ids, include: true
end
class BarSerializer < ActiveModel::Serializer
root :bars
attributes :id
has_many :foos, serializer: FooSerializer, root: :foos, embed: :ids, include: true
end
class Foo < Model
def active_model_serializer; FooSerializer; end
end
class Bar < Model
def active_model_serializer; BarSerializer; end
end
def setup
super
foo = Foo.new(id: 1)
bar = Bar.new(id: 2)
foo.bars = [ bar ]
bar.foos = [ foo ]
collection = [ foo ]
@serializer = collection.active_model_serializer.new(collection, root: :foos)
end
def test_mutual_relation_result
assert_equal({
foos: [{
bar_ids: [ 2 ],
id: 1
}],
bars: [{
foo_ids: [ 1 ],
id: 2
}]
}, @serializer.as_json)
end
def test_mutual_relation_does_not_raise_error
assert_nothing_raised SystemStackError, 'stack level too deep' do
@serializer.as_json
end
end
end
class InclusionTest < AssociationTest
def setup
super
comment_serializer_class = @comment_serializer_class
@post_serializer_class.class_eval do
root :post
embed :ids, include: true
has_many :comments, serializer: comment_serializer_class
end
end
def test_when_it_is_included
post_serializer = @post_serializer_class.new(
@post, include: [:comments]
)
json = post_serializer.as_json
assert_equal({
post: {
title: "New Post",
body: "Body",
comment_ids: [ 1 ]
},
comments: [
{ id: 1, external_id: "COMM001", body: "ZOMG A COMMENT" }
]
}, json)
end
def test_when_it_is_not_included
post_serializer = @post_serializer_class.new(
@post, include: []
)
json = post_serializer.as_json
assert_equal({
post: {
title: "New Post",
body: "Body",
comment_ids: [ 1 ]
}
}, json)
end
def test_when_it_is_excluded
post_serializer = @post_serializer_class.new(
@post, exclude: [:comments]
)
json = post_serializer.as_json
assert_equal({
post: {
title: "New Post",
body: "Body",
comment_ids: [ 1 ]
}
}, json)
end
def test_when_it_is_not_excluded
post_serializer = @post_serializer_class.new(
@post, exclude: []
)
json = post_serializer.as_json
assert_equal({
post: {
title: "New Post",
body: "Body",
comment_ids: [ 1 ]
},
comments: [
{ id: 1, external_id: "COMM001", body: "ZOMG A COMMENT" }
]
}, json)
end
end
class StringSerializerOption < AssociationTest
class StringSerializer < ActiveModel::Serializer
attributes :id, :body
end
def test_specifying_serializer_class_as_string
@post_serializer_class.class_eval do
has_many :comments, embed: :objects
end
include_bare! :comments, serializer: "AssociationTest::StringSerializerOption::StringSerializer"
assert_equal({
comments: [
{ id: 1, body: "ZOMG A COMMENT" }
]
}, @hash)
assert_equal({}, @root_hash)
end
end
end

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test/caching_test.rb
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require "test_helper"
class CachingTest < ActiveModel::TestCase
class NullStore
def fetch(key)
return store[key] if store[key]
store[key] = yield
end
def clear
store.clear
end
def store
@store ||= {}
end
def read(key)
store[key]
end
end
class Programmer
def name
'Adam'
end
def skills
%w(ruby)
end
def read_attribute_for_serialization(name)
send name
end
end
def test_serializers_have_a_cache_store
ActiveModel::Serializer.cache = NullStore.new
assert_kind_of NullStore, ActiveModel::Serializer.cache
end
def test_serializers_can_enable_caching
serializer = Class.new(ActiveModel::Serializer) do
cached true
end
assert serializer.perform_caching
end
def test_serializers_use_cache
serializer = Class.new(ActiveModel::Serializer) do
cached true
attributes :name, :skills
def self.to_s
'serializer'
end
def cache_key
object.name
end
end
serializer.cache = NullStore.new
instance = serializer.new Programmer.new
instance.to_json
assert_equal(instance.serializable_hash, serializer.cache.read('serializer/Adam/serialize'))
assert_equal(instance.to_json, serializer.cache.read('serializer/Adam/to-json'))
end
def test_array_serializer_uses_cache
serializer = Class.new(ActiveModel::ArraySerializer) do
cached true
def self.to_s
'array_serializer'
end
def cache_key
'cache-key'
end
end
serializer.cache = NullStore.new
instance = serializer.new [Programmer.new]
instance.to_json
assert_equal instance.serializable_array, serializer.cache.read('array_serializer/cache-key/serialize')
assert_equal instance.to_json, serializer.cache.read('array_serializer/cache-key/to-json')
end
end

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test/generators_test.rb
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require 'test_helper'
class Foo < Rails::Application
if Rails.version.to_s.start_with? '4'
config.eager_load = false
config.secret_key_base = 'abc123'
end
end
Rails.application.load_generators
require 'generators/serializer/serializer_generator'
class SerializerGeneratorTest < Rails::Generators::TestCase
destination File.expand_path("../tmp", __FILE__)
setup :prepare_destination
tests Rails::Generators::SerializerGenerator
arguments %w(account name:string description:text business:references)
def test_generates_a_serializer
run_generator
assert_file "app/serializers/account_serializer.rb", /class AccountSerializer < ActiveModel::Serializer/
end
def test_generates_a_namespaced_serializer
run_generator ["admin/account"]
assert_file "app/serializers/admin/account_serializer.rb", /class Admin::AccountSerializer < ActiveModel::Serializer/
end
def test_uses_application_serializer_if_one_exists
Object.const_set(:ApplicationSerializer, Class.new)
run_generator
assert_file "app/serializers/account_serializer.rb", /class AccountSerializer < ApplicationSerializer/
ensure
Object.send :remove_const, :ApplicationSerializer
end
# def test_uses_namespace_application_serializer_if_one_exists
# Object.const_set(:SerializerNamespace, Module.new)
# SerializerNamespace.const_set(:ApplicationSerializer, Class.new)
# Rails::Generators.namespace = SerializerNamespace
# run_generator
# assert_file "app/serializers/serializer_namespace/account_serializer.rb",
# /module SerializerNamespace\n class AccountSerializer < ApplicationSerializer/
# ensure
# Object.send :remove_const, :SerializerNamespace
# Rails::Generators.namespace = nil
# end
def test_uses_given_parent
Object.const_set(:ApplicationSerializer, Class.new)
run_generator ["Account", "--parent=MySerializer"]
assert_file "app/serializers/account_serializer.rb", /class AccountSerializer < MySerializer/
ensure
Object.send :remove_const, :ApplicationSerializer
end
def test_generates_attributes_and_associations
run_generator
assert_file "app/serializers/account_serializer.rb" do |serializer|
assert_match(/^ attributes :id, :name, :description$/, serializer)
assert_match(/^ has_one :business$/, serializer)
end
end
def test_with_no_attributes_does_not_add_extra_space
run_generator ["account"]
assert_file "app/serializers/account_serializer.rb" do |content|
assert_no_match /\n\nend/, content
end
end
end

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test/no_serialization_scope_test.rb
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@ -1,34 +0,0 @@
require "test_helper"
class NoSerializationScopeTest < ActionController::TestCase
class ScopeSerializer
def initialize(object, options)
@object, @options = object, options
end
def as_json(*)
{ scope: @options[:scope].as_json }
end
end
class ScopeSerializable
def active_model_serializer
ScopeSerializer
end
end
class NoSerializationScopeController < ActionController::Base
serialization_scope nil
def index
render json: ScopeSerializable.new
end
end
tests NoSerializationScopeController
def test_disabled_serialization_scope
get :index, format: :json
assert_equal '{"scope":null}', @response.body
end
end

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test/serialization_scope_name_test.rb
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@ -1,99 +0,0 @@
require 'test_helper'
require 'pathname'
class DefaultScopeNameTest < ActionController::TestCase
TestUser = Struct.new(:name, :admin)
class UserSerializer < ActiveModel::Serializer
attributes :admin?
def admin?
current_user.admin
end
end
class UserTestController < ActionController::Base
protect_from_forgery
before_filter { request.format = :json }
def current_user
TestUser.new('Pete', false)
end
def render_new_user
render json: TestUser.new('pete', false), serializer: UserSerializer
end
end
tests UserTestController
def test_default_scope_name
get :render_new_user
assert_equal '{"user":{"admin":false}}', @response.body
end
end
class SerializationScopeNameTest < ActionController::TestCase
TestUser = Struct.new(:name, :admin)
class AdminUserSerializer < ActiveModel::Serializer
attributes :admin?
def admin?
current_admin.admin
end
end
class AdminUserTestController < ActionController::Base
protect_from_forgery
serialization_scope :current_admin
before_filter { request.format = :json }
def current_admin
TestUser.new('Bob', true)
end
def render_new_user
render json: TestUser.new('pete', false), serializer: AdminUserSerializer
end
end
tests AdminUserTestController
def test_override_scope_name_with_controller
get :render_new_user
assert_equal '{"admin_user":{"admin":true}}', @response.body
end
end
class SerializationActionScopeOverrideTest < ActionController::TestCase
TestUser = Struct.new(:name, :admin)
class AdminUserSerializer < ActiveModel::Serializer
attributes :admin?
def admin?
current_admin.admin
end
end
class AdminUserTestController < ActionController::Base
protect_from_forgery
before_filter { request.format = :json }
def current_admin
TestUser.new('Bob', true)
end
def render_new_user
render json: TestUser.new('pete', false), serializer: AdminUserSerializer, scope: current_admin, scope_name: :current_admin
end
end
tests AdminUserTestController
def test_override_scope_name_with_controller
get :render_new_user
assert_equal '{"admin_user":{"admin":true}}', @response.body
end
end

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test/serialization_test.rb
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@ -1,394 +0,0 @@
require 'test_helper'
require 'pathname'
class RenderJsonTest < ActionController::TestCase
class JsonRenderable
def as_json(options={})
hash = { a: :b, c: :d, e: :f }
hash.except!(*options[:except]) if options[:except]
hash
end
def to_json(options = {})
super except: [:c, :e]
end
end
class JsonSerializer
def initialize(object, options={})
@object, @options = object, options
end
def as_json(*)
hash = { object: serializable_hash, scope: @options[:scope].as_json }
hash.merge!(options: true) if @options[:options]
hash.merge!(check_defaults: true) if @options[:check_defaults]
hash
end
def serializable_hash
@object.as_json
end
end
class JsonSerializable
def initialize(skip=false)
@skip = skip
end
def active_model_serializer
JsonSerializer unless @skip
end
def as_json(*)
{ serializable_object: true }
end
end
class CustomSerializer
def initialize(*)
end
def as_json(*)
{ hello: true }
end
end
class AnotherCustomSerializer
def initialize(*)
end
def as_json(*)
{ rails: 'rocks' }
end
end
class DummyCustomSerializer < ActiveModel::Serializer
attributes :id
end
class HypermediaSerializable
def active_model_serializer
HypermediaSerializer
end
end
class HypermediaSerializer < ActiveModel::Serializer
def as_json(*)
{ link: hypermedia_url }
end
end
class CustomArraySerializer < ActiveModel::ArraySerializer
self.root = "items"
end
class TestController < ActionController::Base
protect_from_forgery
serialization_scope :current_user
attr_reader :current_user
def self.controller_path
'test'
end
def render_json_nil
render json: nil
end
def render_json_render_to_string
render text: render_to_string(json: '[]')
end
def render_json_hello_world
render json: ActiveSupport::JSON.encode(hello: 'world')
end
def render_json_hello_world_with_status
render json: ActiveSupport::JSON.encode(hello: 'world'), status: 401
end
def render_json_hello_world_with_callback
render json: ActiveSupport::JSON.encode(hello: 'world'), callback: 'alert'
end
def render_json_with_custom_content_type
render json: ActiveSupport::JSON.encode(hello: 'world'), content_type: 'text/javascript'
end
def render_symbol_json
render json: ActiveSupport::JSON.encode(hello: 'world')
end
def render_json_nil_with_custom_serializer
render json: nil, serializer: DummyCustomSerializer
end
def render_json_with_extra_options
render json: JsonRenderable.new, except: [:c, :e]
end
def render_json_without_options
render json: JsonRenderable.new
end
def render_json_with_serializer
@current_user = Struct.new(:as_json).new(current_user: true)
render json: JsonSerializable.new
end
def render_json_with_serializer_and_implicit_root
@current_user = Struct.new(:as_json).new(current_user: true)
render json: [JsonSerializable.new]
end
def render_json_with_serializer_and_options
@current_user = Struct.new(:as_json).new(current_user: true)
render json: JsonSerializable.new, options: true
end
def render_json_with_serializer_and_scope_option
@current_user = Struct.new(:as_json).new(current_user: true)
scope = Struct.new(:as_json).new(current_user: false)
render json: JsonSerializable.new, scope: scope
end
def render_json_with_serializer_api_but_without_serializer
@current_user = Struct.new(:as_json).new(current_user: true)
render json: JsonSerializable.new(true)
end
# To specify a custom serializer for an object, use :serializer.
def render_json_with_custom_serializer
render json: Object.new, serializer: CustomSerializer
end
# To specify a custom serializer for each item in the Array, use :each_serializer.
def render_json_array_with_custom_serializer
render json: [Object.new], each_serializer: CustomSerializer
end
def render_json_array_with_wrong_option
render json: [Object.new], serializer: CustomSerializer
end
def render_json_with_links
render json: HypermediaSerializable.new
end
def render_json_array_with_no_root
render json: [], root: false
end
def render_json_empty_array
render json: []
end
def render_json_array_with_custom_array_serializer
render json: [], serializer: CustomArraySerializer
end
private
def default_serializer_options
defaults = {}
defaults.merge!(check_defaults: true) if params[:check_defaults]
defaults.merge!(root: :awesome) if params[:check_default_root]
defaults.merge!(scope: :current_admin) if params[:check_default_scope]
defaults.merge!(serializer: AnotherCustomSerializer) if params[:check_default_serializer]
defaults.merge!(each_serializer: AnotherCustomSerializer) if params[:check_default_each_serializer]
defaults
end
end
tests TestController
def setup
# enable a logger so that (e.g.) the benchmarking stuff runs, so we can get
# a more accurate simulation of what happens in "real life".
super
@controller.logger = Logger.new(nil)
@request.host = "www.nextangle.com"
end
def test_render_json_nil
get :render_json_nil
assert_equal 'null', @response.body
assert_equal 'application/json', @response.content_type
end
def test_render_json_render_to_string
get :render_json_render_to_string
assert_equal '[]', @response.body
end
def test_render_json_nil_with_custom_serializer
get :render_json_nil_with_custom_serializer
assert_equal "{\"dummy_custom\":null}", @response.body
end
def test_render_json
get :render_json_hello_world
assert_equal '{"hello":"world"}', @response.body
assert_equal 'application/json', @response.content_type
end
def test_render_json_with_status
get :render_json_hello_world_with_status
assert_equal '{"hello":"world"}', @response.body
assert_equal 401, @response.status
end
def test_render_json_with_callback
get :render_json_hello_world_with_callback
assert_equal 'alert({"hello":"world"})', @response.body
# For JSONP, Rails 3 uses application/json, but Rails 4 uses text/javascript
assert_match %r(application/json|text/javascript), @response.content_type.to_s
end
def test_render_json_with_custom_content_type
get :render_json_with_custom_content_type
assert_equal '{"hello":"world"}', @response.body
assert_equal 'text/javascript', @response.content_type
end
def test_render_symbol_json
get :render_symbol_json
assert_equal '{"hello":"world"}', @response.body
assert_equal 'application/json', @response.content_type
end
def test_render_json_forwards_extra_options
get :render_json_with_extra_options
assert_equal '{"a":"b"}', @response.body
assert_equal 'application/json', @response.content_type
end
def test_render_json_calls_to_json_from_object
get :render_json_without_options
assert_equal '{"a":"b"}', @response.body
end
def test_render_json_with_serializer
get :render_json_with_serializer
assert_match '"scope":{"current_user":true}', @response.body
assert_match '"object":{"serializable_object":true}', @response.body
end
def test_render_json_with_serializer_checking_defaults
get :render_json_with_serializer, check_defaults: true
assert_match '"scope":{"current_user":true}', @response.body
assert_match '"object":{"serializable_object":true}', @response.body
assert_match '"check_defaults":true', @response.body
end
def test_render_json_with_serializer_checking_default_serailizer
get :render_json_with_serializer, check_default_serializer: true
assert_match '{"rails":"rocks"}', @response.body
end
def test_render_json_with_serializer_checking_default_scope
get :render_json_with_serializer, check_default_scope: true
assert_match '"scope":"current_admin"', @response.body
end
def test_render_json_with_serializer_and_implicit_root
get :render_json_with_serializer_and_implicit_root
assert_match '"test":[{"serializable_object":true}]', @response.body
end
def test_render_json_with_serializer_and_implicit_root_checking_default_each_serailizer
get :render_json_with_serializer_and_implicit_root, check_default_each_serializer: true
assert_match '"test":[{"rails":"rocks"}]', @response.body
end
def test_render_json_with_serializer_and_options
get :render_json_with_serializer_and_options
assert_match '"scope":{"current_user":true}', @response.body
assert_match '"object":{"serializable_object":true}', @response.body
assert_match '"options":true', @response.body
end
def test_render_json_with_serializer_and_scope_option
get :render_json_with_serializer_and_scope_option
assert_match '"scope":{"current_user":false}', @response.body
end
def test_render_json_with_serializer_and_scope_option_checking_default_scope
get :render_json_with_serializer_and_scope_option, check_default_scope: true
assert_match '"scope":{"current_user":false}', @response.body
end
def test_render_json_with_serializer_api_but_without_serializer
get :render_json_with_serializer_api_but_without_serializer
assert_match '{"serializable_object":true}', @response.body
end
def test_render_json_with_custom_serializer
get :render_json_with_custom_serializer
assert_match '{"hello":true}', @response.body
end
def test_render_json_with_custom_serializer_checking_default_serailizer
get :render_json_with_custom_serializer, check_default_serializer: true
assert_match '{"hello":true}', @response.body
end
def test_render_json_array_with_custom_serializer
get :render_json_array_with_custom_serializer
assert_match '{"test":[{"hello":true}]}', @response.body
end
def test_render_json_array_with_wrong_option
assert_raise ArgumentError do
get :render_json_array_with_wrong_option
end
end
def test_render_json_array_with_custom_serializer_checking_default_each_serailizer
get :render_json_array_with_custom_serializer, check_default_each_serializer: true
assert_match '{"test":[{"hello":true}]}', @response.body
end
def test_render_json_with_links
get :render_json_with_links
assert_match '{"link":"http://www.nextangle.com/hypermedia"}', @response.body
end
def test_render_json_array_with_no_root
get :render_json_array_with_no_root
assert_equal '[]', @response.body
end
def test_render_json_array_with_no_root_checking_default_root
get :render_json_array_with_no_root, check_default_root: true
assert_equal '[]', @response.body
end
def test_render_json_empty_array
get :render_json_empty_array
assert_equal '{"test":[]}', @response.body
end
def test_render_json_empty_array_checking_default_root
get :render_json_empty_array, check_default_root: true
assert_equal '{"awesome":[]}', @response.body
end
def test_render_json_empty_array_with_array_serializer_root_false
ActiveModel::ArraySerializer.root = false
get :render_json_empty_array
assert_equal '[]', @response.body
ensure # teardown
ActiveModel::ArraySerializer.root = nil
end
def test_render_json_array_with_custom_array_serializer
get :render_json_array_with_custom_array_serializer
assert_equal '{"items":[]}', @response.body
end
end

51
test/serializer_support_test.rb
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@ -1,51 +0,0 @@
require "test_helper"
class RandomModel
include ActiveModel::SerializerSupport
end
class OtherRandomModel
include ActiveModel::SerializerSupport
end
class OtherRandomModelSerializer
end
class RandomModelCollection
include ActiveModel::ArraySerializerSupport
end
module ActiveRecord
class Relation
end
end
module Mongoid
class Criteria
end
end
class SerializerSupportTest < ActiveModel::TestCase
test "it returns nil if no serializer exists" do
assert_equal nil, RandomModel.new.active_model_serializer
end
test "it returns a deducted serializer if it exists exists" do
assert_equal OtherRandomModelSerializer, OtherRandomModel.new.active_model_serializer
end
test "it returns ArraySerializer for a collection" do
assert_equal ActiveModel::ArraySerializer, RandomModelCollection.new.active_model_serializer
end
test "it automatically includes array_serializer in active_record/relation" do
ActiveSupport.run_load_hooks(:active_record)
assert_equal ActiveModel::ArraySerializer, ActiveRecord::Relation.new.active_model_serializer
end
test "it automatically includes array_serializer in mongoid/criteria" do
ActiveSupport.run_load_hooks(:mongoid)
assert_equal ActiveModel::ArraySerializer, Mongoid::Criteria.new.active_model_serializer
end
end

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test/serializer_test.rb
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test/test_fakes.rb
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class Model
def initialize(hash={})
@attributes = hash
end
def read_attribute_for_serialization(name)
@attributes[name]
end
def as_json(*)
{ model: "Model" }
end
end
class ModelWithActiveModelSerializer < Model
include ActiveModel::Serializers::JSON
attr_accessor :attributes
def read_attribute_for_serialization(name)
@attributes[name]
end
end
class User
include ActiveModel::SerializerSupport
attr_accessor :superuser
def initialize(hash={})
@attributes = hash.merge(first_name: "Jose", last_name: "Valim", password: "oh noes yugive my password")
end
def read_attribute_for_serialization(name)
@attributes[name]
end
def super_user?
@superuser
end
end
class Post < Model
def initialize(attributes)
super(attributes)
self.comments ||= []
self.comments_disabled = false
self.author = nil
end
attr_accessor :comments, :comments_disabled, :author
def active_model_serializer; PostSerializer; end
end
class Comment < Model
def active_model_serializer; CommentSerializer; end
end
class UserSerializer < ActiveModel::Serializer
attributes :first_name, :last_name
def serializable_hash
attributes.merge(ok: true).merge(options[:scope])
end
end
class UserAttributesWithKeySerializer < ActiveModel::Serializer
attributes first_name: :f_name, last_name: :l_name
def serializable_hash
attributes.merge(ok: true).merge(options[:scope])
end
end
class UserAttributesWithSomeKeySerializer < ActiveModel::Serializer
attributes :first_name, last_name: :l_name
def serializable_hash
attributes.merge(ok: true).merge(options[:scope])
end
end
class UserAttributesWithUnsymbolizableKeySerializer < ActiveModel::Serializer
attributes :first_name, last_name: :"last-name"
def serializable_hash
attributes.merge(ok: true).merge(options[:scope])
end
end
class DefaultUserSerializer < ActiveModel::Serializer
attributes :first_name, :last_name
end
class MyUserSerializer < ActiveModel::Serializer
attributes :first_name, :last_name
def serializable_hash
hash = attributes
hash = hash.merge(super_user: true) if object.super_user?
hash
end
end
class CommentSerializer
def initialize(comment, options={})
@object = comment
end
attr_reader :object
def serializable_hash
{ title: @object.read_attribute_for_serialization(:title) }
end
def as_json(options=nil)
options ||= {}
if options[:root] == false
serializable_hash
else
{ comment: serializable_hash }
end
end
end
class PostSerializer < ActiveModel::Serializer
attributes :title, :body
has_many :comments, serializer: CommentSerializer
end
class PostWithConditionalCommentsSerializer < ActiveModel::Serializer
root :post
attributes :title, :body
has_many :comments, serializer: CommentSerializer
def include_associations!
include! :comments unless object.comments_disabled
end
end
class PostWithMultipleConditionalsSerializer < ActiveModel::Serializer
root :post
attributes :title, :body, :author
has_many :comments, serializer: CommentSerializer
def include_comments?
!object.comments_disabled
end
def include_author?
scope.super_user?
end
end
class Blog < Model
attr_accessor :author
end
class AuthorSerializer < ActiveModel::Serializer
attributes :first_name, :last_name
end
class BlogSerializer < ActiveModel::Serializer
has_one :author, serializer: AuthorSerializer
end
class BlogWithRootSerializer < BlogSerializer
root true
end
class CustomPostSerializer < ActiveModel::Serializer
attributes :title
end
class CustomBlog < Blog
attr_accessor :public_posts, :public_user
end
class CustomBlogSerializer < ActiveModel::Serializer
has_many :public_posts, key: :posts, serializer: PostSerializer
has_one :public_user, key: :user, serializer: UserSerializer
end
class SomeSerializer < ActiveModel::Serializer
attributes :some
end
class SomeObject < Struct.new(:some)
end
# Set up some classes for polymorphic testing
class Attachment < Model
def attachable
@attributes[:attachable]
end
def readable
@attributes[:readable]
end
def edible
@attributes[:edible]
end
end

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test/test_helper.rb
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require "rubygems"
require "bundler/setup"
require 'simplecov'
SimpleCov.start do
add_group "lib", "lib"
add_group "spec", "spec"
end
require 'coveralls'
Coveralls.wear!
require "pry"
require "active_model_serializers"
require "active_support/json"
require "minitest/autorun"
require 'rails'
module TestHelper
Routes = ActionDispatch::Routing::RouteSet.new
Routes.draw do
resource :hypermedia
get ':controller(/:action(/:id))'
get ':controller(/:action)'
end
ActionController::Base.send :include, Routes.url_helpers
ActiveModel::Serializer.send :include, Routes.url_helpers
end
ActiveSupport::TestCase.class_eval do
setup do
@routes = ::TestHelper::Routes
end
end
class Object
undef_method :id if respond_to?(:id)
end