Add mounted_helpers to routes

mounted_helpers are a bit similar to url_helpers. They're automatically
included in controllers for Rails.application and each of mounted
Engines. Mounted helper allows to call url_for and named helpers for
given application.

Given Blog::Engine mounted as blog_engine, there are 2 helpers defined:
app and blog_engine. You can call routes for app and engine using those
helpers:

app.root_url
app.url_for(:controller => "foo")
blog_engine.posts_path
blog_engine.url_for(@post)

1 files changed, 26 insertions, 0 deletions

diff --git a/actionpack/lib/action_controller/railties/url_helpers.rb b/actionpack/lib/action_controller/railties/url_helpers.rb
new file mode 100644
index 0000000000..3e6f211cda
--- /dev/null
+++ b/actionpack/lib/action_controller/railties/url_helpers.rb
@@ -0,0 +1,26 @@
+module ActionController
+  module Railties
+
+    module UrlHelpers
+      def self.with(routes)
+        Module.new do
+          define_method(:inherited) do |klass|
+            super(klass)
+            klass.send(:include, routes.url_helpers)
+          end
+        end
+      end
+    end
+
+    module MountedHelpers
+      def self.with(routes, name = nil)
+        Module.new do
+          define_method(:inherited) do |klass|
+            super(klass)
+            klass.send(:include, routes.mounted_helpers(name))
+          end
+        end
+      end
+    end
+  end
+end