Set sweeper's @controller to nil after a request so that the controller may be collected between requests.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3529 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Set sweeper's @controller to nil after a request so that the controller may be collected between requests.
+
 * Subclasses of ActionController::Caching::Sweeper should be Reloadable. [Rick Olson]
 
 * Document the :xhr option for verifications. #3666 [leeo]

actionpack/lib/action_controller/caching.rb

@@ -532,6 +532,8 @@ module ActionController #:nodoc:
 
         def after(controller)
           callback(:after)
+          # Clean up, so that the controller can be collected after this request
+          self.controller = nil
         end
 
         private