Make test attributes explicit

- Organize test poros with associations and by serializer
- Freeze derived attributes/associations against mutation
- Cleanup PORO fixtures

test/fixtures/poro.rb

@@ -1,25 +1,27 @@
-verbose = $VERBOSE
-$VERBOSE = nil
 class Model < ActiveModelSerializers::Model
   FILE_DIGEST = Digest::MD5.hexdigest(File.open(__FILE__).read)
 
-  ### Helper methods, not required to be serializable
+  # Defaults to the downcased model name.
+  def id
+    @id ||= self.class.model_name.name.downcase
+  end
 
-  # Convenience when not adding @attributes readers and writers
-  def method_missing(meth, *args)
-    if meth.to_s =~ /^(.*)=$/
-      attributes[Regexp.last_match(1).to_sym] = args[0]
-    elsif attributes.key?(meth)
-      attributes[meth]
-    else
-      super
+  # At this time, just for organization of intent
+  class_attribute :association_names
+  self.association_names = []
+
+  def self.associations(*names)
+    self.association_names |= names.map(&:to_sym)
+    # Silence redefinition of methods warnings
+    ActiveModelSerializers.silence_warnings do
+      attr_accessor(*names)
     end
   end
 
-  # required for ActiveModel::AttributeAssignment#_assign_attribute
-  # in Rails 5
-  def respond_to_missing?(method_name, _include_private = false)
-    attributes.key?(method_name.to_s.tr('=', '').to_sym) || super
+  def associations
+    association_names.each_with_object({}) do |association_name, result|
+      result[association_name] = public_send(association_name).freeze
+    end.with_indifferent_access.freeze
   end
 end
 
@@ -30,67 +32,59 @@ end
 #   model = ModelWithErrors.new
 #   model.validate!            # => ["cannot be nil"]
 #   model.errors.full_messages # => ["name cannot be nil"]
-class ModelWithErrors < ::ActiveModelSerializers::Model
+class ModelWithErrors < Model
   attributes :name
 end
 
 class Profile < Model
+  attributes :name, :description
+  associations :comments
 end
-
 class ProfileSerializer < ActiveModel::Serializer
   attributes :name, :description
-
-  # TODO: is this used anywhere?
-  def arguments_passed_in?
-    instance_options[:my_options] == :accessible
-  end
 end
-
 class ProfilePreviewSerializer < ActiveModel::Serializer
   attributes :name
 end
 
-class Post < Model; end
-class Like < Model; end
-class Author < Model; end
-class Bio < Model; end
-class Blog < Model; end
-class Role < Model; end
-class User < Model; end
-class Location < Model; end
-class Place < Model; end
-class Tag < Model; end
-class VirtualValue < Model; end
+class Author < Model
+  attributes :name
+  associations :posts, :bio, :roles, :comments
+end
+class AuthorSerializer < ActiveModel::Serializer
+  cache key: 'writer', skip_digest: true
+  attribute :id
+  attribute :name
+
+  has_many :posts
+  has_many :roles
+  has_one :bio
+end
+class AuthorPreviewSerializer < ActiveModel::Serializer
+  attributes :id
+  has_many :posts
+end
+
 class Comment < Model
-  # Uses a custom non-time-based cache key
-  def cache_key
-    "#{self.class.name.downcase}/#{id}"
-  end
+  attributes :body, :date
+  associations :post, :author, :likes
+end
+class CommentSerializer < ActiveModel::Serializer
+  cache expires_in: 1.day, skip_digest: true
+  attributes :id, :body
+  belongs_to :post
+  belongs_to :author
+end
+class CommentPreviewSerializer < ActiveModel::Serializer
+  attributes :id
+
+  belongs_to :post
 end
 
-class Employee < ActiveRecord::Base
-  has_many :pictures, as: :imageable
-  has_many :object_tags, as: :taggable
+class Post < Model
+  attributes :title, :body
+  associations :author, :comments, :blog, :tags, :related
 end
-
-class ObjectTag < ActiveRecord::Base
-  belongs_to :poly_tag
-  belongs_to :taggable, polymorphic: true
-end
-
-class Picture < ActiveRecord::Base
-  belongs_to :imageable, polymorphic: true
-  has_many :object_tags, as: :taggable
-end
-
-class PolyTag < ActiveRecord::Base
-  has_many :object_tags
-end
-
-module Spam
-  class UnrelatedLink < Model; end
-end
-
 class PostSerializer < ActiveModel::Serializer
   cache key: 'post', expires_in: 0.1, skip_digest: true
   attributes :id, :title, :body
@@ -102,58 +96,79 @@ class PostSerializer < ActiveModel::Serializer
   def blog
     Blog.new(id: 999, name: 'Custom blog')
   end
-
-  # TODO: is this used anywhere?
-  def custom_options
-    instance_options
-  end
 end
-
 class SpammyPostSerializer < ActiveModel::Serializer
   attributes :id
   has_many :related
 end
+class PostPreviewSerializer < ActiveModel::Serializer
+  attributes :title, :body, :id
 
-class CommentSerializer < ActiveModel::Serializer
-  cache expires_in: 1.day, skip_digest: true
-  attributes :id, :body
+  has_many :comments, serializer: ::CommentPreviewSerializer
+  belongs_to :author, serializer: ::AuthorPreviewSerializer
+end
+class PostWithTagsSerializer < ActiveModel::Serializer
+  attributes :id
+  has_many :tags
+end
+class PostWithCustomKeysSerializer < ActiveModel::Serializer
+  attributes :id
+  has_many :comments, key: :reviews
+  belongs_to :author, key: :writer
+  has_one :blog, key: :site
+end
+
+class Bio < Model
+  attributes :content, :rating
+  associations :author
+end
+class BioSerializer < ActiveModel::Serializer
+  cache except: [:content], skip_digest: true
+  attributes :id, :content, :rating
 
-  belongs_to :post
   belongs_to :author
-
-  def custom_options
-    instance_options
-  end
 end
 
-class AuthorSerializer < ActiveModel::Serializer
-  cache key: 'writer', skip_digest: true
+class Blog < Model
+  attributes :name, :type, :special_attribute
+  associations :writer, :articles
+end
+class BlogSerializer < ActiveModel::Serializer
+  cache key: 'blog'
+  attributes :id, :name
+
+  belongs_to :writer
+  has_many :articles
+end
+class AlternateBlogSerializer < ActiveModel::Serializer
   attribute :id
-  attribute :name
-
-  has_many :posts
-  has_many :roles
-  has_one :bio
+  attribute :name, key: :title
+end
+class CustomBlogSerializer < ActiveModel::Serializer
+  attribute :id
+  attribute :special_attribute
+  has_many :articles
 end
 
+class Role < Model
+  attributes :name, :description, :special_attribute
+  associations :author
+end
 class RoleSerializer < ActiveModel::Serializer
   cache only: [:name, :slug], skip_digest: true
   attributes :id, :name, :description
   attribute :friendly_id, key: :slug
+  belongs_to :author
 
   def friendly_id
     "#{object.name}-#{object.id}"
   end
-
-  belongs_to :author
 end
 
-class LikeSerializer < ActiveModel::Serializer
-  attributes :id, :time
-
-  belongs_to :likeable
+class Location < Model
+  attributes :lat, :lng
+  associations :place
 end
-
 class LocationSerializer < ActiveModel::Serializer
   cache only: [:address], skip_digest: true
   attributes :id, :lat, :lng
@@ -165,81 +180,40 @@ class LocationSerializer < ActiveModel::Serializer
   end
 end
 
+class Place < Model
+  attributes :name
+  associations :locations
+end
 class PlaceSerializer < ActiveModel::Serializer
   attributes :id, :name
-
   has_many :locations
 end
 
-class BioSerializer < ActiveModel::Serializer
-  cache except: [:content], skip_digest: true
-  attributes :id, :content, :rating
-
-  belongs_to :author
+class Like < Model
+  attributes :time
+  associations :likeable
+end
+class LikeSerializer < ActiveModel::Serializer
+  attributes :id, :time
+  belongs_to :likeable
 end
 
-class BlogSerializer < ActiveModel::Serializer
-  cache key: 'blog'
-  attributes :id, :name
-
-  belongs_to :writer
-  has_many :articles
-end
-
-class PaginatedSerializer < ActiveModel::Serializer::CollectionSerializer
-  def json_key
-    'paginated'
+module Spam
+  class UnrelatedLink < Model
+  end
+  class UnrelatedLinkSerializer < ActiveModel::Serializer
+    cache only: [:id]
+    attributes :id
   end
 end
 
-class AlternateBlogSerializer < ActiveModel::Serializer
-  attribute :id
-  attribute :name, key: :title
-end
-
-class CustomBlogSerializer < ActiveModel::Serializer
-  attribute :id
-  attribute :special_attribute
-
-  has_many :articles
-end
-
-class CommentPreviewSerializer < ActiveModel::Serializer
-  attributes :id
-
-  belongs_to :post
-end
-
-class AuthorPreviewSerializer < ActiveModel::Serializer
-  attributes :id
-
-  has_many :posts
-end
-
-class PostPreviewSerializer < ActiveModel::Serializer
-  attributes :title, :body, :id
-
-  has_many :comments, serializer: CommentPreviewSerializer
-  belongs_to :author, serializer: AuthorPreviewSerializer
-end
-
-class PostWithTagsSerializer < ActiveModel::Serializer
-  attributes :id
-
-  has_many :tags
-end
-
-class PostWithCustomKeysSerializer < ActiveModel::Serializer
-  attributes :id
-
-  has_many :comments, key: :reviews
-  belongs_to :author, key: :writer
-  has_one :blog, key: :site
+class Tag < Model
+  attributes :name
 end
 
+class VirtualValue < Model; end
 class VirtualValueSerializer < ActiveModel::Serializer
   attributes :id
-
   has_many :reviews, virtual_value: [{ type: 'reviews', id: '1' },
                                      { type: 'reviews', id: '2' }]
   has_one :maker, virtual_value: { type: 'makers', id: '1' }
@@ -251,36 +225,8 @@ class VirtualValueSerializer < ActiveModel::Serializer
   end
 end
 
-class PolymorphicHasManySerializer < ActiveModel::Serializer
-  attributes :id, :name
-end
-
-class PolymorphicBelongsToSerializer < ActiveModel::Serializer
-  attributes :id, :title
-
-  has_one :imageable, serializer: PolymorphicHasManySerializer, polymorphic: true
-end
-
-class PolymorphicSimpleSerializer < ActiveModel::Serializer
-  attributes :id
-end
-
-class PolymorphicObjectTagSerializer < ActiveModel::Serializer
-  attributes :id
-
-  has_many :taggable, serializer: PolymorphicSimpleSerializer, polymorphic: true
-end
-
-class PolymorphicTagSerializer < ActiveModel::Serializer
-  attributes :id, :phrase
-
-  has_many :object_tags, serializer: PolymorphicObjectTagSerializer
-end
-
-module Spam
-  class UnrelatedLinkSerializer < ActiveModel::Serializer
-    cache only: [:id]
-    attributes :id
+class PaginatedSerializer < ActiveModel::Serializer::CollectionSerializer
+  def json_key
+    'paginated'
   end
 end
-$VERBOSE = verbose