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.
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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.
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We got rid of the Association.refine method which generated subclasses.
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Associations doesn't know anymore about the source serializer. That didn't make any sense.
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Passing options[:hash] is not public API of include!. That was removed.
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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
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VERSION 0.8.1

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.