#http://guides.rubyonrails.org/plugins.html
 
module Yaffle 
  def self.included(base)  
    base.send :extend, ClassMethods 
  end  
 
  module ClassMethods 
    def acts_as_yaffle(options = {})  
      cattr_accessor :yaffle_text_field  
      self.yaffle_text_field = (options[:yaffle_text_field] || :last_squawk).to_s 
      send :include, InstanceMethods 
    end  
  end  
  
  module InstanceMethods 
    def squawk(string)  
      write_attribute(self.class.yaffle_text_field, string.to_squawk)  
    end  
  end 
end 
 
ActiveRecord::Base.send :include, Yaffle