How should I use Draper in my ApplicationController?

问题

My questions refers to the following development stack:

• Rails 3.2.1
• Draper 0.14
• Ancestry 1.2.5

What I want to do is, deliver the navigation to my layout. So I've defined a before filter in my ApplicationController.

class ApplicationController < ActionController::Base
  [..]
  before_filter :current_navigation
  [..]
  def current_navigation
    @n = PublicationDecorator.find(1)
  end
end

As you see in the code listing above, I'm using the draper. My PublicationDecorator isn't available in the ApplicationController. So how do I get all my Publications decorated?

uninitialized constant ApplicationController::PublicationDecorator

I'm using the ancestry gem to realize a hierarchy. A further question is, will be all objects decorated, if I'm using ancestry?

回答1:

Make your PublicationDecorator available in your ApplicationController.

require 'publication_decorator.rb' # <--
class ApplicationController < ActionController::Base
  [..]
  before_filter :current_navigation
  [..]
  def current_navigation
    @n = PublicationDecorator.find(1)
  end
end

To get children or even parents decorated add the association to your decorator:

class PublicationDecorator < Draper::Base
  decorates :publication
  decorates_association :children
  [..]

end

来源：https://stackoverflow.com/questions/10870306/how-should-i-use-draper-in-my-applicationcontroller