Decorator Pattern with Ruby in 8 lines - http://goo.gl/d960j

decorator-pattern-with-ruby-in-8-lines.rb

module Decorator
  def initialize(decorated)
    @decorated = decorated
  end

  def method_missing(method, *args)
    args.empty? ? @decorated.send(method) : @decorated.send(method, args)
  end
end

draper-gem.rb

# app/decorators/article_decorator.rb
class ArticleDecorator < Draper::Decorator
  delegate_all

  def publication_status
    if published?
      "Published at #{published_at}"
    else
      "Unpublished"
    end
  end

  def published_at
    object.published_at.strftime("%A, %B %e")
  end
  
  def emphatic
    h.content_tag(:strong, "Awesome")
  end
end

# app/controllers/articles_controller.rb
def show
  @article = Article.find(params[:id]).decorate
end