1 files changed, 4 insertions, 14 deletions
diff --git a/activemodel/lib/active_model/serializers/json.rb b/activemodel/lib/active_model/serializers/json.rb
index e94512fd64..ee6d48bfc6 100644
--- a/activemodel/lib/active_model/serializers/json.rb
+++ b/activemodel/lib/active_model/serializers/json.rb
@@ -5,6 +5,7 @@ module ActiveModel
   module Serializers
     module JSON
       extend ActiveSupport::Concern
+      include ActiveModel::Serialization
 
       included do
         extend ActiveModel::Naming
@@ -12,19 +13,6 @@ module ActiveModel
         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+.
       #
@@ -92,7 +80,9 @@ module ActiveModel
       #                   {"comments": [{"body": "Don't think too hard"}],
       #                    "title": "So I was thinking"}]}
       def encode_json(encoder)
-        Serializer.new(self, encoder.options).to_s
+        hash = serializable_hash(encoder.options)
+        hash = { self.class.model_name.element => hash } if include_root_in_json
+        ActiveSupport::JSON.encode(hash)
       end
 
       def as_json(options = nil)