pass app config to controller helper proxy

After this fix application config become available when calling helper outisde of view

config/application.rb

    #...
    config.asset_host = 'http://mycdn.com'
    #...

Somewhere else

    ActionController::Base.helpers.asset_path('fallback.png')
    # => http://mycdn.com/assets/fallback.png

1 files changed, 5 insertions, 1 deletions

diff --git a/actionpack/lib/action_controller/metal/helpers.rb b/actionpack/lib/action_controller/metal/helpers.rb
index b53ae7f29f..a9c3e438fb 100644
--- a/actionpack/lib/action_controller/metal/helpers.rb
+++ b/actionpack/lib/action_controller/metal/helpers.rb
@@ -73,7 +73,11 @@ module ActionController
 
       # Provides a proxy to access helpers methods from outside the view.
       def helpers
-        @helper_proxy ||= ActionView::Base.new.extend(_helpers)
+        @helper_proxy ||= begin 
+          proxy = ActionView::Base.new
+          proxy.config = config.inheritable_copy
+          proxy.extend(_helpers)
+        end
       end
 
       # Overwrite modules_for_helpers to accept :all as argument, which loads