Cache JavaScriptGenerator's helper module set on the template

1 files changed, 20 insertions, 2 deletions

diff --git a/actionpack/lib/action_view/helpers/prototype_helper.rb b/actionpack/lib/action_view/helpers/prototype_helper.rb
index 09dbb67c0a..ff83494e94 100644
--- a/actionpack/lib/action_view/helpers/prototype_helper.rb
+++ b/actionpack/lib/action_view/helpers/prototype_helper.rb
@@ -588,8 +588,26 @@ module ActionView
 
         private
           def include_helpers_from_context
-            @context.send(:extended_by_without_helpers).each { |mod| extend mod }
-            extend GeneratorMethods
+            unless generator_methods_module = @context.instance_variable_get(:@__javascript_generator_methods__)
+              modules = @context.extended_by - ([ActionView::Helpers] + ActionView::Helpers.included_modules)
+
+              generator_methods_module = Module.new do
+                modules.each do |mod|
+                  begin
+                    include mod
+                  rescue Exception => e
+                    # HACK: Probably not a good idea to suppress these warnings
+                    # AFAIK exceptions are only raised in while testing with mocha
+                    # because the module does not like to be included into other
+                    # non TestUnit classes
+                  end
+                end
+                include GeneratorMethods
+              end
+              @context.instance_variable_set(:@__javascript_generator_methods__, generator_methods_module)
+            end
+
+            extend generator_methods_module
           end
 
         # JavaScriptGenerator generates blocks of JavaScript code that allow you