Reuse named route helper module between Routing reloads to prevent memory leaks.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5548 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Reuse named route helper module between Routing reloads. Use remove_method to delete named route methods after each load. Since the module is never collected, this fixes a significant memory leak. [Nicholas Seckar]
+
 * ActionView::Base.erb_variable accessor names the buffer variable used to render templates. Defaults to _erbout; use _buf for erubis.  [Rick Olson]
 
 * assert_select_rjs :remove.  [Dylan Egan]

actionpack/lib/action_controller/routing.rb

@@ -996,7 +996,11 @@ module ActionController
         def clear!
           @routes = {}
           @helpers = []
-          @module = Module.new
+          
+          @module ||= Module.new
+          @module.instance_methods.each do |selector|
+            @module.send :remove_method, selector
+          end
         end
 
         def add(name, route)