move the serialized AR record logic to #as_json. Leave ActiveRecord::…

…Base#to_json to use the same Object#to_json implementation, but keep it around for documentation purposes.

activerecord/lib/active_record/serializers/json_serializer.rb

@@ -74,13 +74,15 @@ def self.included(base)
     #                   {"comments": [{"body": "Don't think too hard"}],
     #                    "title": "So I was thinking"}]}
     def to_json(options = {})
+      super
+    end
+
+    def as_json(options = nil) #:nodoc:
       hash = Serializer.new(self, options).serializable_record
       hash = { self.class.model_name.element => hash } if include_root_in_json
-      ActiveSupport::JSON.encode(hash)
+      hash
     end
 
-    def as_json(options = nil) self end #:nodoc:
-
     def from_json(json)
       self.attributes = ActiveSupport::JSON.decode(json)
       self