在heroku上发送延迟的电子邮件rails
我的数据库中有一个表，其中包含要发送的电子邮件列表，每封电子邮件都在特定时间（精确到分钟）。
我在heroku上，现在不想花任何东西..有办法做到这一点吗？我想到的唯一方法是在其他地方创建一个守护进程/cron 并使其每分钟调用一个私有 url.. 还有其他想法吗？有什么办法可以有一些后台进程或可以处理这个问题的东西（在 Heroku 上并且无需支付额外的插件费用..）？
谢谢！
I have a table in my database with a list of emails to be sent, each at a specific time (precision down to the minute).
I'm on heroku, and I don't want to spend anything right now.. Is there a way to do this? The only way I thought was to create a deamon/cron somewhere else and make it call a private url every minute.. any other idea? Any way to have some background process or something that can handle this (on Heroku and without paying extra for addons..)?
thanks!
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Heroku 的免费 cron 插件每天只运行一次，所以它不适合。他们的付费 cron 插件每小时只运行一次，所以它也不适合。在其他地方运行守护进程/cron 是一种很快就会出现问题的黑客行为。这从根本上来说是糟糕的架构。
将 delayed_job 与单个 Heroku Worker 一起使用是有意义的。另外，delayed_job 允许您准确指定每个作业的运行时间，粒度小至 5 秒。是的，执行此操作的费用为 36 美元/月。但它可以让你免于以错误的方式做事。另外，如果您预计大部分时间都不需要 Worker，您可以研究 Heroku 上的自动缩放delayed_job，这样 Worker 仅在您需要时才打开。
Heroku's free cron addon runs only once a day, so it is not suitable. Their paid cron addon runs only once an hour, so it is also not suitable. Running a daemon/cron elsewhere is a hack that will become problematic very quickly. It's fundamentally bad architecture.
Using delayed_job with a single Heroku Worker makes sense. Plus, delayed_job lets you specify exactly when each job should be run, down to a 5-second granularity. Yes, it is $36/mo to do this. But it frees you from doing things the wrong way. Plus, if you expect that you will not need the Worker most of the time, you can look into auto-scaling delayed_job on Heroku so the Worker is only turned on when you need it.
有一大堆免费的在线服务，它们非常乐意按照您设置的时间表请求您的网页。您不需要花费或编写任何代码。只需谷歌:)
There is a whole bunch of free online services that would be more than happy to request your web page on a schedule that you set. You don't need to spend or code anything. Just Google :)