在活动开始前一小时触发的最佳方法 [英] Best way to trigger an hour before event starts

问题描述

我有很多Appointment模型在一天的不同时间开始，分别是:00，:15，:30，:45 .我想触发代码以在活动开始前 1小时发送提醒.使用后台工作者触发此操作的最佳方法是什么?我也在使用发条 gem，因此我可以安排Sidekiq工人.

I have many Appointment models that start at various times of the day, either at :00, :15, :30, :45. I'd like to trigger code to send a reminder 1 hour before the event starts. What would be the best way to use a background worker to trigger this? I'm using the clockwork gem as well so I can schedule Sidekiq workers.

推荐答案

clockwork gem用于固定计划作业(替代cron).您将要使用sidekiq随附的ActionMailer.delay_until:

The clockwork gem is for fixed schedule jobs (a replacement for cron). You'll want to use ActionMailer.delay_until that comes with sidekiq:

class Appointment
  after_create :queue_reminder

  def queue_reminder
    MyMailer.delay_until(event_time - 1.hour).appointment_reminder(id)
  end
end

在此处查看sidekiq文档: https://github.com/mperham/sidekiq/wiki/Delayed-Extensions

正如shock_one所述，如果用新日期更新约会，则必须重新安排提醒并取消旧的提醒.如果Appointment被销毁，您还想取消作业.

As shock_one mentioned, if you update an appointment with a new date, you'll have to requeue a reminder and cancel the old one. You'll also want to cancel a job if an Appointment is destroyed.

为此，我建议您使用 sidekiq-status 和reminder_job_id柱子.您的Appointment模型将如下所示:

For that, I'd advise you use sidekiq-status, and a reminder_job_id column. Your Appointment model would then look something like:

class Appointment
  before_save :queue_reminder, if: :event_time_changed?
  after_destroy :cancel_reminder, if: :reminder_job_id?

  def queue_reminder
    cancel_reminder if reminder_job_id
    self.reminder_job_id = MyMailer.delay_until(event_time - 1.hour)
                                   .appointment_reminder(id)
  end

  def cancel_reminder
    Sidekiq::Status.cancel reminder_job_id
  end
end

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