Curtains

Curtains provides simple model decorators for Rails 4.

Installation

Add this line to your application's Gemfile:

gem "curtains"

And then execute:

$ bundle

Or install it yourself as:

$ gem install curtains

Usage

In either controllers or views you may call decorate to wrap a model in a decorator. The name of the decorator class is inferred from the name of the model, so for example, the Address model will be wrapped with AddressDecorator.

# app/views/addresses/show.html.erb
<%= decorate(@address).formatted_address_tag %>

The decorate helper also supports enumerable collections and will return an array of decorated objects:

# app/views/addresses/index.html.erb
<%= decorate(@addresses).each do |address| %>
	<%= address.formatted_address_tag %>
<% end %>

Additionally, the decorate helper yields its result to a block if provided:

# app/views/addresses/show.html.erb
<%= decorate(@address) do |address| %>
	<div class="name">
		<%= address.formatted_name %>
	</div>
	<%= address.formatted_address_tag %>
<% end %>

These decorators should be placed in the app/decorators folder and should inherit from Curtains::Decorator. For example:

# app/decorators/address_decorator.rb
class AddressDecorator < Curtains::Decorator
	def formatted_address_tag
		content_tag :address, address.lines.join("<br/>").html_safe
	end

	def formatted_name
		return "N/A" if name.blank?
		name
	end
end

Inherited Resources Compatibility

Call decorate_resources in your controller to add automatic decorating to the resource, build_resource and collection methods provided by Inherited Resources:

# app/controllers/address_controller.rb
class AddressesController < InheritedResources::Base
  decorate_resources
end

# app/views/addresses/show.html.erb
<%= resource.formatted_address_tag %>

Meta

Handcrafted by Patrick Hogan [github]

Released under the MIT License.