Callback in a module in Ruby on Rails

callback in a module in Ruby on Rails.rb

# http://stackoverflow.com/questions/7444522/is-it-possible-to-define-a-before-save-callback-in-a-module

class Model
  include MyModule
  #...
end

# lib/my_module.rb
module MyModule
  extend ActiveSupport::Concern

  included do
    before_save :do_something
  end

  def do_something
    #do whatever
  end
end

# config/application.rb
module Ilitia
  class Application < Rails::Application
    config.autoload_paths += Dir["#{config.root}/lib"]
    #...
  end
end