require 'active_support/json' require 'active_support/core_ext/class/attribute_accessors' module ActiveModel module Serializers module JSON extend ActiveSupport::Concern included do extend ActiveModel::Naming cattr_accessor :include_root_in_json, :instance_writer => false end class Serializer < ActiveModel::Serializer def serializable_hash model = super @serializable.include_root_in_json ? { @serializable.class.model_name.element => model } : model end def serialize ActiveSupport::JSON.encode(serializable_hash) end end # Returns a JSON string representing the model. Some configuration is # available through +options+. # # The option ActiveRecord::Base.include_root_in_json controls the # top-level behavior of to_json. In a new Rails application, it is set to # true in initializers/new_rails_defaults.rb. When it is true, # to_json will emit a single root node named after the object's type. For example: # # konata = User.find(1) # ActiveRecord::Base.include_root_in_json = true # konata.to_json # # => { "user": {"id": 1, "name": "Konata Izumi", "age": 16, # "created_at": "2006/08/01", "awesome": true} } # # ActiveRecord::Base.include_root_in_json = false # konata.to_json # # => {"id": 1, "name": "Konata Izumi", "age": 16, # "created_at": "2006/08/01", "awesome": true} # # The remainder of the examples in this section assume include_root_in_json is set to # false. # # Without any +options+, the returned JSON string will include all # the model's attributes. For example: # # konata = User.find(1) # konata.to_json # # => {"id": 1, "name": "Konata Izumi", "age": 16, # "created_at": "2006/08/01", "awesome": true} # # The :only and :except options can be used to limit the attributes # included, and work similar to the +attributes+ method. For example: # # konata.to_json(:only => [ :id, :name ]) # # => {"id": 1, "name": "Konata Izumi"} # # konata.to_json(:except => [ :id, :created_at, :age ]) # # => {"name": "Konata Izumi", "awesome": true} # # To include any methods on the model, use :methods. # # konata.to_json(:methods => :permalink) # # => {"id": 1, "name": "Konata Izumi", "age": 16, # "created_at": "2006/08/01", "awesome": true, # "permalink": "1-konata-izumi"} # # To include associations, use :include. # # konata.to_json(:include => :posts) # # => {"id": 1, "name": "Konata Izumi", "age": 16, # "created_at": "2006/08/01", "awesome": true, # "posts": [{"id": 1, "author_id": 1, "title": "Welcome to the weblog"}, # {"id": 2, author_id: 1, "title": "So I was thinking"}]} # # 2nd level and higher order associations work as well: # # konata.to_json(:include => { :posts => { # :include => { :comments => { # :only => :body } }, # :only => :title } }) # # => {"id": 1, "name": "Konata Izumi", "age": 16, # "created_at": "2006/08/01", "awesome": true, # "posts": [{"comments": [{"body": "1st post!"}, {"body": "Second!"}], # "title": "Welcome to the weblog"}, # {"comments": [{"body": "Don't think too hard"}], # "title": "So I was thinking"}]} def encode_json(encoder) Serializer.new(self, encoder.options).to_s end def as_json(options = nil) self end def from_json(json) self.attributes = ActiveSupport::JSON.decode(json) self end end end end