A Widget

inherited_decorators.rb

class WidgetDecorator::Base < ApplicationDecorator
  def display_title
    ""
  end
end

class WidgetDecorator < WidgetDecorator::Base
  decorates :widget
  def display_title
    #...
  end
end

class MetalWidgetDecorator < WidgetDecorator::Base
  decorates :metal_widget
  def display_title
    #...
  end
end

metal_widget.rb

class MetalWidget
  attr_accessor :band_name, :number_of_demo_tapes
end

class MetalWidgetDecorator < ApplicationWidget
  decorates :metal_widget

  def display_title
    <<-BAND_STUFF
    We are #{band_name}!  Thanks for coming.  Please pick up one of our
    #{number_of_demo_tapes} excellent early albums from the site before you go
    BAND_STUFF
  end
end

widget.rb

class Widget
  attr_accessible :name, :feature

  def display_title
    "#{name} - #{rand(10)}"
  end
end

widget_refactor.rb

class Widget
  attr_accessible :name, :feature
end

class WidgetDecorator < ApplicationDecorator
  decorates :widget

  def display_title
    "Hello, my name is #{name} - I've been in #{rand(10)} bands."
  end
end

widget_show.html.haml

%h1 Widget!
%p
  Name:
  = @widget.display_title