From fa51c5f574d240d0d24add87ae75c7221d29de5d Mon Sep 17 00:00:00 2001
From: Nicholas Mulder <nicholas.mulder@gmail.com>
Date: Thu, 28 Feb 2013 10:01:40 -0500
Subject: [PATCH] Add ActiveSupport::DescendantsTracker to Serializer and
 ArraySerializer

---
 lib/active_model/array_serializer.rb | 4 ++++
 lib/active_model/serializer.rb       | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/lib/active_model/array_serializer.rb b/lib/active_model/array_serializer.rb
index f0a2ab02..15f24523 100644
--- a/lib/active_model/array_serializer.rb
+++ b/lib/active_model/array_serializer.rb
@@ -1,4 +1,6 @@
 require "active_support/core_ext/class/attribute"
+require 'active_support/dependencies'
+require 'active_support/descendants_tracker'
 
 module ActiveModel
   # Active Model Array Serializer
@@ -11,6 +13,8 @@ module ActiveModel
   #     ActiveModel::ArraySerializer.root = false
   #
   class ArraySerializer
+    extend ActiveSupport::DescendantsTracker
+
     attr_reader :object, :options
 
     class_attribute :root
diff --git a/lib/active_model/serializer.rb b/lib/active_model/serializer.rb
index b070664c..9d772a1d 100644
--- a/lib/active_model/serializer.rb
+++ b/lib/active_model/serializer.rb
@@ -1,5 +1,7 @@
 require "active_support/core_ext/class/attribute"
 require "active_support/core_ext/module/anonymous"
+require 'active_support/dependencies'
+require 'active_support/descendants_tracker'
 
 module ActiveModel
   # Active Model Serializer
@@ -36,6 +38,8 @@ module ActiveModel
   #     end
   #
   class Serializer
+    extend ActiveSupport::DescendantsTracker
+
     INCLUDE_METHODS = {}
     INSTRUMENT = { :serialize => :"serialize.serializer", :associations => :"associations.serializer" }