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, 6 insertions, 0 deletions

diff --git a/actionpack/test/controller/helper_test.rb b/actionpack/test/controller/helper_test.rb
index 248c81193e..20f99f19ee 100644
--- a/actionpack/test/controller/helper_test.rb
+++ b/actionpack/test/controller/helper_test.rb
@@ -201,6 +201,12 @@ class HelperTest < ActiveSupport::TestCase
     # fun/pdf_helper.rb
     assert methods.include?(:foobar)
   end
+  
+  def test_helper_proxy_config
+    AllHelpersController.config.my_var = 'smth'
+    
+    assert_equal 'smth', AllHelpersController.helpers.config.my_var
+  end
 
   private
     def expected_helper_methods