This commit merges most of the work done by Piotr Sarnacki in his Ruby Summer of Code project.

His work brings several capabilities from app to engines, as routes, middleware stack, asset handling and much more. Please check Rails::Engine documentation for more refenrences.

Merge remote branch 'drogus/engines'

1 files changed, 20 insertions, 0 deletions

diff --git a/actionpack/lib/action_controller/railties/paths.rb b/actionpack/lib/action_controller/railties/paths.rb
new file mode 100644
index 0000000000..fa71d55946
--- /dev/null
+++ b/actionpack/lib/action_controller/railties/paths.rb
@@ -0,0 +1,20 @@
+module ActionController
+  module Railties
+    module Paths
+      def self.with(app)
+        Module.new do
+          define_method(:inherited) do |klass|
+            super(klass)
+            if namespace = klass.parents.detect {|m| m.respond_to?(:_railtie) }
+              klass.helpers_path = namespace._railtie.config.paths.app.helpers.to_a
+            else
+              klass.helpers_path = app.config.helpers_paths
+            end
+
+            klass.helper :all if klass.superclass == ActionController::Base
+          end
+        end
+      end
+    end
+  end
+end