如何要求ActiveSupport的rescue_from方法？

Question

我有這樣的代碼在application controller：

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

我想這個進入一個模塊，然後：

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

現在我模塊的樣子：

# 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google了'我如何在模塊中包含rescue_from？' - 我還是有點迷路。

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