过滤之前的邮件Rails 3 [英] Before filter in action mailer Rails 3

问题描述

我需要：

What I need:

与Rails 3中的ActionMailer中的before_filter类似。

Something similar to before_filter in ActionMailer in Rails 3.

问题：

Problem:

我正在Rails 3在ActionMailer中有一个before_filter。选中了 actionmailer api 并了解了before_action和after_action回调。实现时会产生错误：

I am working on Rails 3 and want to have a before_filter in ActionMailer. Checked the actionmailer api and learned about before_action and after_action callbacks. When implemented it gives the error:

NoMethodError: undefined method `before_action' for Notifier:Class

后来发现没有之前的操作调用Rails 3从这 post

Later learned that there is no before action call for Rails 3 from this post

没有任何钩子或gem，所以我们可以像before_filter in Rails 3。

Isnt there any hook or gem so that we can have something similar like before_filter in Rails 3.

请帮忙。非常感谢！

推荐答案

它可以通过包括AbstractController :: Callbacks来实现。这模仿了Rails 4的改变，除了评论和测试，只是包括回调。

It can be achieved by including AbstractController::Callbacks. This mimics the change to Rails 4 which apart from comments and tests, just included Callbacks.

class MyMailer < ActionMailer::Base
  include AbstractController::Callbacks

  after_filter :check_email

  def some_mail_action(user)
    @user = user
    ...
  end

  private
   def check_email
     if @user.email.nil?
     message.perform_deliveries = false
    end
    true
   end

end

参考 - 如何在UserMailer中添加before_filter，检查是否可以邮寄用户？

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