From 0093dafd804c59ea1685cdab2a79b37d63c8dbf0 Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Wed, 29 Aug 2012 15:36:11 -0500
Subject: [PATCH] Use class_attribute so we dont bleed

---
 actionpack/lib/action_controller/metal/conditional_get.rb | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/actionpack/lib/action_controller/metal/conditional_get.rb b/actionpack/lib/action_controller/metal/conditional_get.rb
index 1445b3e383..870938df8f 100644
--- a/actionpack/lib/action_controller/metal/conditional_get.rb
+++ b/actionpack/lib/action_controller/metal/conditional_get.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/class/attribute'
+
 module ActionController
   module ConditionalGet
     extend ActiveSupport::Concern
@@ -5,7 +7,10 @@ module ActionController
     include RackDelegation
     include Head
 
-    included { cattr_accessor(:etaggers) { Array.new } }
+    included do
+      class_attribute :etaggers
+      self.etaggers = []
+    end
 
     module ClassMethods
       # Allows you to consider additional controller-wide information when generating an etag.