在特定时间在 Rails 中执行操作
有没有办法在 ROR 中设置在特定时间触发的回调？
假设我正在举办一场在某个时间到期的比赛。假设 7 月 28 日星期一 9:00。我想设置一个观察者，在 7 月 28 日星期一 9:00 运行一个函数。 Rails 有办法做到这一点吗？
Is there a way to setup a callback in ROR that would trigger at a specific time?
Lets say I'm running a contest that expries at a certain time. Lets say Monday July 28th at 9:00. I'd like to set up an observer that ran a function at Monday July 28th at 9:00. Does rails have a method to do this?
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延迟作业中有一个 run_at 字段。您必须在后台有一个工作进程始终运行并寻找一组要运行的作业，但如果您的应用程序经常这样做，那么它可能比总是编写新的 cron 作业更容易。
因此，您可以在
Contest模型中有一个方法，该方法在after_create回调中调用，该方法设置延迟作业，以便在指定日期向随机获胜者发送电子邮件这是指定的。不过，如果这是一次性的或非常罕见的交易，我会同意每当
There's a run_at field in Delayed Job. You have to have a worker process in the background always running and looking for jobs that a set to run, but if your application is doing this a lot, it might be easier than always writing new cron jobs.
So, you could have a method in your
Contestmodel that gets called in aafter_createcallback that sets up a delayed job to send out an email to a random winner at the date that's specified.If it's a one time, or very infrequent deal, though, I'll agree about using whenever
您最好编写一个 ruby 脚本，在您需要的确切时间通过 crontab 运行。
You'd be better off writing a ruby script that runs via crontab at the exact time you need it to.
我同意 crontab，但我喜欢无论何时。它很好地集成到 cron 中，您可以将其与存储库一起存储，并且它与 capistrano 很好地集成。
I agree about crontab, but I like whenever. It has a nice integration into cron that you can store with your repo and it integrates nicely with capistrano.