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[depot.git] / vendor / rails / activerecord / lib / active_record / serializers / json_serializer.rb

diff --git a/vendor/rails/activerecord/lib/active_record/serializers/json_serializer.rb b/vendor/rails/activerecord/lib/active_record/serializers/json_serializer.rb
new file mode 100644 (file)
index 0000000..419b45d
--- /dev/null
+++ b/vendor/rails/activerecord/lib/active_record/serializers/json_serializer.rb
@@ -0,0 +1,80 @@
+module ActiveRecord #:nodoc:
+  module Serialization
+    def self.included(base)
+      base.cattr_accessor :include_root_in_json, :instance_writer => false
+      base.extend ClassMethods
+    end
+
+    # Returns a JSON string representing the model. Some configuration is
+    # available through +options+.
+    #
+    # 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 <tt>:only</tt> and <tt>:except</tt> 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 <tt>:methods</tt>.
+    #
+    #   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 <tt>:include</tt>.
+    #
+    #   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 to_json(options = {})
+      if include_root_in_json
+        "{#{self.class.json_class_name}: #{JsonSerializer.new(self, options).to_s}}"
+      else
+        JsonSerializer.new(self, options).to_s
+      end
+    end
+
+    def from_json(json)
+      self.attributes = ActiveSupport::JSON.decode(json)
+      self
+    end
+
+    class JsonSerializer < ActiveRecord::Serialization::Serializer #:nodoc:
+      def serialize
+        serializable_record.to_json
+      end
+    end
+
+    module ClassMethods
+      def json_class_name
+        @json_class_name ||= name.demodulize.underscore.inspect
+      end
+    end
+  end
+end