class ActiveModel::Serializer


end
end
post.author == options[:scope]
def author?
end
hash
hash.merge!(:email => post.email) if author?
hash = super
def attributes
private
has_many :comments
attributes :title, :body
class PostSerializer < ActiveModel::Serializer
author of the post:
For example, some attributes maybe only be returned if current_user is the
We use the scope to check if a given attribute should be serialized or not.
in for authorization purposes.
The object to be serialized is the +@post+ and the current user is passed
PostSerializer.new(@post, :scope => current_user).to_json
one may do in a controller:
it expects to object as arguments, a resource and options. For example,
control how a given object is going to be serialized. On initialization,
Provides a basic serializer implementation that allows you to easily
Active Model Serializer

def as_json(options=nil)

object including the root.
Returns a json representation of the serializable 
def as_json(options=nil)
  options ||= {}
  if root = options.fetch(:root, @options.fetch(:root, _root))
    @options[:hash] = hash = {}
    @options[:unique_values] = {}
    hash.merge!(root => serializable_hash)
    hash
  else
    serializable_hash
  end
end

def associate(klass, attrs) #:nodoc:

:nodoc: 
def associate(klass, attrs) #:nodoc:
  options = attrs.extract_options!
  self._associations = _associations.dup
  attrs.each do |attr|
    unless method_defined?(attr)
      class_eval "def #{attr}() object.#{attr} end", __FILE__, __LINE__
    end
    self._associations[attr] = klass.refine(attr, options)
  end
end

def attribute(attr, options={}) 

def attribute(attr, options={})
  self._attributes = _attributes.merge(attr => options[:key] || attr)
  unless method_defined?(attr)
    class_eval "def #{attr}() object.read_attribute_for_serialization(:#{attr}) end", __FILE__, __LINE__
  end
end

def attributes(*attrs)

Define attributes to be used in the serialization. 
def attributes(*attrs)
  self._attributes = _attributes.dup
  attrs.each do |attr|
    attribute attr
  end
end

def attributes

object attributes.
Returns a hash representation of the serializable 
def attributes
  hash = {}
  _attributes.each do |name,key|
    hash[key] = read_attribute_for_serialization(name)
  end
  hash
end

def embed(type, options={})


embed :ids, :include => true # Embed the association ids and include objects in the root
embed :ids # Embed only the association ids
embed :objects # Embed associations as full objects

Define how associations should be embedded. 
def embed(type, options={})
  self._embed = type
  self._root_embed = true if options[:include]
end

def has_many(*attrs)

dispatched to the serialized object.
with the association name does not exist, the association name is
as a method which should return an array when invoked. If a method
The serializer object should implement the association name

Defines an association in the object should be rendered. 
def has_many(*attrs)
  associate(Associations::HasMany, attrs)
end

def has_one(*attrs)

dispatched to the serialized object.
with the association name does not exist, the association name is
as a method which should return an object when invoked. If a method
The serializer object should implement the association name

Defines an association in the object should be rendered. 
def has_one(*attrs)
  associate(Associations::HasOne, attrs)
end

def include!(name, options={}) 

def include!(name, options={})
  # Make sure that if a special options[:hash] was passed in, we generate
  # a new unique values hash and don't clobber the original. If the hash
  # passed in is the same as the current options hash, use the current
  # unique values.
  #
  # TODO: Should passing in a Hash even be public API here?
  unique_values =
    if hash = options[:hash]
      if @options[:hash] == hash
        @options[:unique_values] ||= {}
      else
        {}
      end
    else
      hash = @options[:hash]
      @options[:unique_values] ||= {}
    end
  node = options[:node]
  value = options[:value]
  association_class =
    if klass = _associations[name]
      klass
    elsif value.respond_to?(:to_ary)
      Associations::HasMany
    else
      Associations::HasOne
    end
  association = association_class.new(name, self, options)
  if association.embed_ids?
    node[association.key] = association.serialize_ids
    if association.embed_in_root?
      merge_association hash, association.root, association.serialize_many, unique_values
    end
  elsif association.embed_objects?
    node[association.key] = association.serialize
  end
end

def include_associations!(node) 

def include_associations!(node)
  _associations.each do |attr, klass|
    opts = { :node => node }
    if options.include?(:include) || options.include?(:exclude)
      opts[:include] = included_association?(attr)
    end
    include! attr, opts
  end
end

def included_association?(name) 

def included_association?(name)
  if options.key?(:include)
    options[:include].include?(name)
  elsif options.key?(:exclude)
    !options[:exclude].include?(name)
  else
    true
  end
end

def inherited(klass) #:nodoc:

:nodoc: 
def inherited(klass) #:nodoc:
  return if klass.anonymous?
  name = klass.name.demodulize.underscore.sub(/_serializer$/, '')
  klass.class_eval do
    alias_method name.to_sym, :object
    root name.to_sym unless self._root == false
  end
end

def initialize(object, options={}) 

def initialize(object, options={})
  @object, @options = object, options
end

def instrument(name, payload = {}, &block)

The event name is: name.class_name.serializer
Use ActiveSupport::Notifications to send events to external systems. 
def instrument(name, payload = {}, &block)
  ActiveSupport::Notifications.instrument("#{name}.serializer", payload, &block)
end

def merge_association(hash, key, value, unique_values)

we want to merge a new list of values.
avoids the need to scan through the Array looking for entries every time
a unique list of all of the objects that are already in the Array. This
In order to make this efficient, we store a :unique_values hash containing

of all tags for all comments of the post.
which has_many tags, the top-level :tags key will contain the merged list
content for all of the children. For instance, if a Post has_many comments,
In some cases, an Array of associations is built by merging the associated 
def merge_association(hash, key, value, unique_values)
  if current_value = unique_values[key]
    current_value.merge! value
    hash[key] = current_value.to_a
  elsif value
    hash[key] = value
    unique_values[key] = OrderedSet.new(value)
  end
end

def model_class

The model class associated with this serializer. 
def model_class
  name.sub(/Serializer$/, '').constantize
end

def root(name)

Defines the root used on serialization. If false, disables the root. 
def root(name)
  self._root = name
end

def schema

figure out a way to decouple those two.
TODO: This is currently coupled to Active Record. We need to

to work.
methods on your custom models if you want the serializer's schema method
methods, provided by default by ActiveRecord. You can implement these
The schema method uses the +columns_hash+ and +reflect_on_association+

which is provided by +SerializerClass.model_class+.
This information is extracted from the serializer's model class,

{ :my_posts => { :has_many => :posts }

the hash looks like this:

end
has_many :posts, :key => :my_posts
class PostsSerializer < ActiveModel::Serializer

If :key is used:

{ :posts => { :has_many => :posts } }
The +associations+ hash looks like this:

{ :name => :string, :age => :integer }

The +attributes+ hash looks like this:

The schema hash has two keys: +attributes+ and +associations+.

can be used to generate clients for the serialized output.
Return a schema hash for the current serializer. This information 
def schema
  klass = model_class
  columns = klass.columns_hash
  attrs = _attributes.inject({}) do |hash, (name,key)|
    column = columns[name.to_s]
    hash.merge key => column.type
  end
  associations = _associations.inject({}) do |hash, (attr,association_class)|
    association = association_class.new(attr, self)
    model_association = klass.reflect_on_association(association.name)
    hash.merge association.key => { model_association.macro => model_association.name }
  end
  { :attributes => attrs, :associations => associations }
end

def serializable_hash

object without the root.
Returns a hash representation of the serializable 
def serializable_hash
  instrument(:serialize, :serializer => self.class.name) do
    node = attributes
    instrument :associations do
      include_associations!(node) if _embed
    end
    node
  end
end

def url_options 

def url_options
  @options[:url_options]
end