From 89cc4f15014cd7d544f912331bed836c5e5c3f0a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafael=20Mendon=C3=A7a=20Fran=C3=A7a?=
 <rafaelmfranca@gmail.com>
Date: Tue, 14 Aug 2012 04:05:37 -0300
Subject: Some release notes love :heart:

---
 guides/source/4_0_release_notes.textile | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(limited to 'guides/source')

diff --git a/guides/source/4_0_release_notes.textile b/guides/source/4_0_release_notes.textile
index 914ba0dd9a..0de8a0a4b7 100644
--- a/guides/source/4_0_release_notes.textile
+++ b/guides/source/4_0_release_notes.textile
@@ -196,6 +196,37 @@ h5(#actioncontroller_deprecations). Deprecations
 
 h4. Action Dispatch
 
+* Add Routing Concerns to declare common routes that can be reused inside others resources and routes.
+
+Code before:
+
+<ruby>
+resources :messages do
+  resources :comments
+end
+
+resources :posts do
+  resources :comments
+  resources :images, only: :index
+end
+</ruby>
+
+Code after:
+
+<ruby>
+concern :commentable do
+  resources :comments
+end
+
+concern :image_attachable do
+  resources :images, only: :index
+end
+
+resources :messages, concerns: :commentable
+
+resources :posts, concerns: [:commentable, :image_attachable]
+</ruby>
+
 * Show routes in exception page while debugging a <tt>RoutingError</tt> in development.
 
 * Include <tt>mounted_helpers</tt> (helpers for accessing mounted engines) in <tt>ActionDispatch::IntegrationTest</tt> by default.
-- 
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