ruby-on-rails - 你如何在 Rails 中每小时调用一个方法？

Question

我正在使用Resque和Redis来处理后台作业。我想每小时调用一次方法 Resque.enqueue(MyModel) 来执行后台任务。

例如：假设我有一个拥有 10,000 个用户的网站。我想每天只调用这个方法 24 次；不是 10,000 * 24。示例方法如下：

Resque.enqueue(MyModel)

提前谢谢你的帮助。我还应该提到我更喜欢坚持使用 Resque，而不是转向延迟工作。谢谢你。

Answer 1

您应该为此类任务使用 cron 作业。

我建议您使用Whenever gem。

在此处查看 railscast：http ://railscasts.com/episodes/164-cron-in-ruby

Answer 2

Since you are already using Resque, I would recommend to use one of the many available Resque plugins: resque-scheduler. Plugs into the Resque UI very nicely as well. Simple setup as explained in the README. Also adds a lot of the missing DelayedJob stuff (delayed execution).

Why I switched from whenever to resque-scheduler:

• Stays in the app-folder and doesn't mess with your cron file.
• To stop all 'crons' just disable the Resque workers.
• Exceptions are logged to the Resque UI.
• Manual rescheduling via the Resque UI possible.
• In combination with resque-loner you prevent double-execution should a job take longer than the span between two executions.
• Still obeys to the priority-system of Resque.
• No additional boot-time (could take up to 60s if your app gets bigger) since it uses Resque's worker-pool.
• One less "tech" used.
• Simple switch: Configuration is done in a cron-like manner.

Answer 3

你可以很容易地使用无论何时，它都能满足你的要求，而且还有更多，它有一个很好的文档。

您可以使用如下语法：

every 3.hours do
    runner "MyModel.some_process"
    rake "my:rake:task"
    command "/usr/bin/my_great_command"
end

使用以下方式安装它：

$ gem install whenever

或将其添加到您的 GemFile：

gem 'whenever', :require => false

然后运行：

$ cd /apps/my-great-project
$ wheneverize .

希望这对你有帮助！