我如何需要ActiveSupport的rescue_from方法？

Question

我有这个代码application controller:

# 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|
...

我得到了: 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.

Answer 1

module Exceptionailer
  # http://api.rubyonrails.org/classes/ActiveSupport/Concern.html
  extend ActiveSupport::Concern

  included do
    rescue_from Exception do |ex|
      ...
    end
  end

end