Fixed that caches_action breaks with file extensions (closes #6257) [Catfish]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5248 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/lib/action_controller/caching.rb

@@ -210,7 +210,7 @@ def after(controller)
           def set_content_type!(action_cache_path)
             if extention = action_cache_path.extension
               content_type = Mime::EXTENSION_LOOKUP[extention]
-              action_cache_path.controller.content_type = content_type.to_s
+              action_cache_path.controller.response.content_type = content_type.to_s
             end
           end
           

actionpack/test/controller/action_caching_test.rb

@@ -121,6 +121,13 @@ def test_empty_path_is_normalized
     assert_equal 'example.org/index', @path_class.path_for(@mock_controller)
   end
   
+  def test_file_extensions
+    get :index, :id => 'kitten.jpg' 
+    get :index, :id => 'kitten.jpg'
+
+    assert_response :success
+  end
+  
   private
   
     def content_to_cache