Question

我想在我的rails应用程序中使用before_destroy回调。我想使用它，因为我在通知中使用它。但是我如何使用before_destroy？

我的代码在before_save和after_save，但我不知道我会为before_destroy做些什么。

class Record < ActiveRecord::Base
  # Callbacks
  before_save {
    @is_new_record = self.new_record? if self.new_record?
  }

  after_save {
    action = @is_new_record ? 'created' : 'updated'
    Notification.publish_notification(self, action)
  }

  ...
  #Some stuffs here

更新

实际上，我想保存表Notification的日志，就像创建新记录一样。像，

User One created new Record.

所以我想在销毁记录之前保存通知。就像。

User One destroy a record.

就像那样。

请帮帮我。

Answer 1

我更喜欢使用方法而不是匿名块。我会按如下方式处理：

class Record < ActiveRecord::Base

  before_save :remember_new_record
  after_save  :write_save_notification
  before_destroy :write_destroy_notification

  # ... the rest of your class ...

  private

    def remember_new_record
      @is_new_record = self.new_record? 
    end

    def write_save_notification 
      action = @is_new_record ? 'created' : 'updated'
      Notification.publish_notification(self, action)
    end

    def write_destroy_notification
      Notification.publish_notification(self, 'destroy')
    end
  end

所以这很简单，除非你做别的事情？

before_destroy在rails上回调

1 个答案: