Variants inline syntax documentation [ci skip]

* Extend method documentation
  * Mention it in actionpack/CHANGELOG
  * Update release notes

actionpack/CHANGELOG.md

@@ -45,6 +45,14 @@
         app/views/projects/show.html+tablet.erb
         app/views/projects/show.html+phone.erb
 
+    You can also simplify the variants definition using the inline syntax:
+
+        respond_to do |format|
+          format.js         { render "trash" }
+          format.html.phone { redirect_to progress_path }
+          format.html.none  { render "trash" }
+        end
+
     *Łukasz Strzałkowski*
 
 *   Fix header `Content-Type: #<Mime::NullType:...>` in localized template.

actionpack/lib/action_controller/metal/mime_responds.rb

@@ -209,6 +209,15 @@ module ActionController #:nodoc:
     #   app/views/projects/show.html+tablet.erb
     #   app/views/projects/show.html+phone.erb
     #
+    # When you're not sharing any code within the format, you can simplify defining variants
+    # using the inline syntax:
+    #
+    #   respond_to do |format|
+    #     format.js         { render "trash" }
+    #     format.html.phone { redirect_to progress_path }
+    #     format.html.none  { render "trash" }
+    #   end
+    #
     # Be sure to check the documentation of +respond_with+ and
     # <tt>ActionController::MimeResponds.respond_to</tt> for more examples.
     def respond_to(*mimes, &block)

guides/source/4_1_release_notes.md

@@ -62,6 +62,16 @@ app/views/projects/show.html+tablet.erb
 app/views/projects/show.html+phone.erb
 ```
 
+You can also simplify the variants definition using the inline syntax:
+
+```ruby
+respond_to do |format|
+  format.js         { render "trash" }
+  format.html.phone { redirect_to progress_path }
+  format.html.none  { render "trash" }
+end
+```
+
 ### Spring
 
 New Rails 4.1 applications will ship with "springified" binstubs. This means