Ruby on rails 改进用于添加或删除标记的通知逻辑

我有一个应用程序，当管理员更改他们的个人资料时，会通过电子邮件通知用户…添加/删除标签，更改地址…等等。这是现有的代码

def event_notification
    if self.creator != self.user
      case self.event_code
      when ADDED_TAGS, REMOVED_TAGS
        Notification.create(notifiable: self, created_by: self.created_by, recipient_id: self.user_id, delivery_time: 1.minute.from_now )
      when ADDRESS_CHANGED
      ...

我们面临的问题是，当有人修改用户标签时，他们通常会在相对较短的时间内添加和删除多个标签。为每个添加或删除的标记生成通知（电子邮件）。我想修改这个事件通知方法，这样如果在给定的时间范围内（比如5分钟）添加/删除标记，那么只创建一个通知

我想我可以在添加的标签、删除的标签中加上某种标志，通知在5分钟内只创建一次。然而，我无法理解这种逻辑，而是在寻找一些想法，或者以不同的方式来看待这个问题

任何想法都值得赞赏

def create_user_event_notification
    if self.creator != self.user
      case self.event_code
      when ADDED_TAGS, REMOVED_TAGS
        last_notification = Notification.where(recipient_id: self.user_id, notification_type: notification_type).last
        unless last_notification.nil?
          if Time.now - last_notification.created_at > 300 #5 minutes
            Notification.create(notifiable: self, created_by: self.created_by, recipient_id: self.user_id,
                            notification_type: Notification::TAG_EDIT, delivery_time: 1.minute.from_now )
          end
        end
      when CHANGED_VACATION_STATUS
        Notification.create(notifiable: self, created_by: self.created_by, recipient_id: self.user_id,
                            notification_type: Notification::VACATION_EDIT, delivery_time: 1.minute.from_now )
      when ADDED_LOCATION, REMOVED_LOCATION, ADDED_COUNTY, REMOVED_COUNTY
        Notification.create(notifiable: self, created_by: self.created_by, recipient_id: self.user_id,
                            notification_type: Notification::LOCATION_EDIT, delivery_time: 1.minute.from_now )
      end
    end
  end