ruby-on-rails - 无法从包含的模块访问方法

Question

我正在学习 ruby​​ on rails 4，并希望在 ActiveSupport 中使用关注。这是我的做法：

控制器/关注点/do_things_controller.rb

# file controllers/concerns/do_things_controller.rb
require 'active_support/concern'
module DoThings
  extend ActiveSupport::Concern

  def do_something
    puts 'something'
  end

  included do
    helper_method :do_something
  end
end

控制器/application_controller.rb

# file controllers/application_controller.rb 
class ApplicationController < ActionController::Base
  require 'concerns/do_things_controller'
  include DoThings
end

在views/layouts/application.html.haml我调用do_something，它显示错误：

undefined method `do_something'

谢谢