decorator

decorator.rb

# from https://github.com/keikun17/yapos/blob/master/app/decorators/decorator.rb

require 'delegate'

class Decorator < SimpleDelegator
  include ActionView::Helpers
  include ActionView::Context
  include Rails.application.routes.url_helpers

  def self.decorate_collection(arr)
    decorated_collection = []
    arr.each do |item|
      decorated_collection << self.new(item)
    end
    decorated_collection
  end

  def decorated_object
    __getobj__
  end
end

Example usage, I think:

class UserDecorator < Decorator
  def full_name
    "#{first_name} #{last_name}"
  end
end

<!-- views -->
<% user = UserDecorator.new(@user) %>
<%= user.first_name %> <!-- "John" -->
<%= user.last_name %>  <!-- "Smith" -->
<%= user.full_name %>  <!-- "John Smith" -->