application_model.rb

class ApplicationModel
  extend Feedable
end

driver.rb

require './feedable'
require './application_model'
require './verso'

puts Verso.feed

feedable.rb

module Feedable
  def act_as_feedable
    extend ClassMethods
  end

  module ClassMethods
    def feed
      self
    end
  end
end

verso.rb

class Verso < ApplicationModel
  act_as_feedable
end