2 files changed, 12 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/abstract.rb b/actionpack/lib/action_controller/abstract.rb
index 3f5c4a185f..48e33282ec 100644
--- a/actionpack/lib/action_controller/abstract.rb
+++ b/actionpack/lib/action_controller/abstract.rb
@@ -1,3 +1,6 @@
+require "active_support/core_ext/module/attr_internal"
+require "active_support/core_ext/module/delegation"
+
 module AbstractController
   autoload :Base,           "action_controller/abstract/base"
   autoload :Callbacks,      "action_controller/abstract/callbacks"
diff --git a/actionpack/lib/action_controller/abstract/base.rb b/actionpack/lib/action_controller/abstract/base.rb
index c9e1081b23..8f2bfb5711 100644
--- a/actionpack/lib/action_controller/abstract/base.rb
+++ b/actionpack/lib/action_controller/abstract/base.rb
@@ -23,6 +23,15 @@ module AbstractController
       end
       
       alias_method :abstract?, :abstract
+
+      def inherited(klass)
+        ::AbstractController::Base.subclasses << klass.to_s
+        super
+      end
+
+      def subclasses
+        @subclasses ||= []
+      end
       
       def internal_methods
         controller = self