Ensure helpers work from configured path.

actionpack/lib/action_controller/base.rb

@@ -7,7 +7,6 @@ module ActionController
     include AbstractController::Translation
 
     include ActionController::Helpers
-    helper :all # By default, all helpers should be included
     
     include ActionController::HideActions
     include ActionController::UrlFor
@@ -67,6 +66,7 @@ module ActionController
     def self.inherited(klass)
       ::ActionController::Base.subclasses << klass.to_s
       super
+      klass.helper :all
     end
 
     def self.subclasses

actionpack/lib/action_controller/metal/helpers.rb

@@ -50,11 +50,8 @@ module ActionController
     include AbstractController::Helpers
 
     included do
-      # Set the default directory for helpers
-      # TODO This should support multiple directories in order
-      # to work with engines
-      extlib_inheritable_accessor(:helpers_dir) do
-        defined?(Rails.root) ? "#{Rails.root}/app/helpers" : "app/helpers"
+      extlib_inheritable_accessor(:helpers_path) do
+        defined?(Rails::Application) ? Rails::Application.paths.app.helpers.to_a : []
       end
     end
 
@@ -107,10 +104,15 @@ module ActionController
         raise e unless e.missing_name? "#{module_name}Helper"
       end
 
-      # Extract helper names from files in app/helpers/**/*.rb
+      # Extract helper names from files in app/helpers/**/*_helper.rb
       def all_application_helpers
-        extract = /^#{Regexp.quote(helpers_dir)}\/?(.*)_helper.rb$/
-        Dir["#{helpers_dir}/**/*_helper.rb"].map { |file| file.sub extract, '\1' }
+        helpers = []
+        helpers_path.each do |path|
+          extract  = /^#{Regexp.quote(path)}\/?(.*)_helper.rb$/
+          helpers += Dir["#{path}/**/*_helper.rb"].map { |file| file.sub(extract, '\1') }
+        end
+        helpers.uniq!
+        helpers
       end
     end
   end

railties/lib/rails/application.rb

@@ -11,8 +11,6 @@ module Rails
     autoload :Railties,       'rails/application/railties'
     autoload :RoutesReloader, 'rails/application/routes_reloader'
 
-    # TODO Check helpers works as expected
-    # TODO Check routes namespaces
     # TODO Ensure production settings are read properly
     class << self
       private :new

railties/lib/rails/engine/configuration.rb

@@ -15,6 +15,7 @@ module Rails
           paths = Rails::Paths::Root.new(@root)
           paths.app                 "app",                 :eager_load => true, :glob => "*"
           paths.app.controllers     "app/controllers",     :eager_load => true
+          paths.app.helpers         "app/helpers",         :eager_load => true
           paths.app.metals          "app/metal",           :eager_load => true
           paths.app.views           "app/views"
           paths.lib                 "lib",                 :load_path => true