,VSPLP"QQMJDBUJPO$POUSPMMFS֦ு 1. extentionͷ࡞ $ cd your_kurko2_rails_apps/ $ cat > lib/controller_extention.rb module ControllerExtention extend ActiveSupport::Concern included do before_action :additional_before_action end private def additional_before_action if signed_in? # do something end end end 2. kuroko2.yml એݴ extentions: controller: - ControllerExtention