使用线程安全时，模型类未在“延迟的作业”中加载 [英] model classes not loading in Delayed Job when using threadsafe

问题描述

我有一个长期运行良好的应用程序。我打开了线程安全！，现在延迟作业无法正常工作，并说找不到我的模型文件之一。

I've got an app that has been working well for a long time. I'm turning on threadsafe!, and now Delayed Job is not working, saying it can't find one of my model files.

Job failed to load: undefined class/module Foo

这不是我在/ lib中定义的自定义作业类，这是一个应用程序/模型中的模型文件

This isn't a custom job class I have defined in /lib, this is a model file in app/models

什么可能导致此类无法加载？

what could be causing this class to not be loaded?

推荐答案

如您所记录的问题上所述，以防其他人首先找到该帖子：

As posted on the issue you logged, in case others find this SO post first:

我也遇到了这个问题...并且这就是我的发现：如果通过rake任务加载应用程序，Rails不会急于加载类（这就是DJ的工作方式）。

I just hit this problem as well... and here's what I found: Rails does not eager load classes if the app is loaded via a rake task (and that's how DJ does its thing).

这是我的 production.rb 中的代码段：

# Enable threaded mode, unless a rake task (likely Delayed Job) is running:
config.threadsafe! unless defined?($rails_rake_task) && $rails_rake_task

Rails设置了由rake任务加载的全局变量。丑陋，但现在看来对我来说还不错...当然，如果您有多线程的rake任务，那么这不是理想的选择，您应该调用Rails.application.eager_load！这些任务。我猜想多线程耙任务很少见。

Rails sets that global variable when it's loaded by a rake task. Ugly, but seems to be working for me fine now... Of course, if you have rake tasks that are multi-threaded, then this is not ideal, and you should probably invoke Rails.application.eager_load! for those tasks. I'm guessing multi-threaded rake tasks are rare though.

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