This is a very simple plugin that adds support for decorators to your Rails application. Effectively all that this does is allow you to register paths in which to search for decorators which are then loaded at the appropriate point in your application's initialisation process.

Decorators must follow this naming convention:

app/decorators/<at least one subdirectory>/something_decorator.rb

This is an example of a decorator that will be loaded:

app/decorators/controllers/pages_controller_decorator.rb

These are examples of decorators that won't be loaded:

app/decorators/pages_controller_decorator.rb
app/decorators/controllers/pages_controller.rb

The important parts are being inside a sub directory of app/decorators and having _decorator.rb at the end of the file's name.

In your Gemfile, add the gem:

gem 'decorators', '~> 1.0.4'

Now, run bundle install and the gem should install.

There really is just one method to call; Decorators#register!. Simply pass one path or many paths to the method to register paths to search inside for decorators to be loaded from.

require 'decorators'
Decorators.register! Rails.root

Or for many paths:

require 'decorators'
Decorators.register! Rails.root, Rails.root.join('vendor', 'extensions', 'extension_with_decorators')

If you are loading this from within a Rails engine definition make sure you require the decorators library in the standard way, from outside of any method definitions:

+require 'decorators'
+
 module Namespaced
   class Engine < Rails::Engine

   initializer 'load decorators' do
-    require 'decorators'
     Decorators.register! Rails.root, Rails.root.join('vendor', 'extensions', 'namespaced')
   end
 end

If this is happening in the main application you can avoid this in config/application.rb:

 require File.expand_path('../boot', __FILE__)

 require 'rails/all'
+require 'decorators'

 if defined?(Bundler)
   # etc

Decorators is released under the MIT license and is copyright (c) 2013 Philip Arndt