我如何需要ActiveSupport的rescue_from方法?

我在application controller有这个代码:

 # Method to capture and handle all exceptions rescue_from Exception do |ex| Rails.logger.debug ex do_stuff(ex) end 

我想把它移到一个模块然后:

 class ApplicationController < ActionController::Base include 'module' ... 

现在我的模块看起来像:

 # lib/exception_mailer.rb require 'action_mailer' require 'active_support' module ExceptionMailer # Method to capture and handle all exceptions rescue_from Exception do |ex| ... 

我得到: undefined method 'rescue_from' for ExceptionMailer:Module

我用Google搜索了“我如何在模块中包含rescue_from?” – 我还有点失落。

 module Exceptionailer # http://api.rubyonrails.org/classes/ActiveSupport/Concern.html extend ActiveSupport::Concern included do rescue_from Exception do |ex| ... end end end