module RockNRole

  def self.included(base)
     base.send :extend, ClassMethods
  end

  module ClassMethods
    def has_rockin_roles
      send :include, InstanceMethods
    end
  end

  module InstanceMethods
    def rock_out
      puts "rock!"
    end
  end

end

# Hook into ActiveRecord.
ActiveRecord::Base.send :include, RockNRole