在加载*后*路由运行的 Rails 初始化程序? [英] Rails initializer that runs *after* routes are loaded?

问题描述

我想在我的 Rails 应用程序启动时设置一个类属性.它需要检查一些路由，因此需要在我的自定义代码运行之前加载这些路由.我很难找到一个可靠的上钩地点.

I want to set a class attribute when my Rails app starts up. It requires inspecting some routes, so the routes need to be loaded before my custom code runs. I am having trouble finding a reliable place to hook in.

这在测试"环境中完美运行:

This works PERFECTLY in the "test" environment:

config.after_initialize do
  Rails.logger.info "#{Rails.application.routes.routes.map(&:path)}"
end

但它不在开发"环境中工作(路线为空)

But it doesn't work in the "development" environment (the routes are empty)

目前，我似乎可以通过在 config.to_prepare 中运行相同的代码来让事情在开发模式下工作，据我所知，这在每个请求之前都会发生.不幸的是，单独使用 to_prepare 似乎在测试模式下不起作用，因此重复.

For now I seem to have things working in development mode by running the same code in config.to_prepare which I understand happens before every request. Unfortunately using to_prepare alone doesn't seem to work in test mode, hence the duplication.

我很好奇为什么在测试模式下在 after_initialize 之前加载了路由，但在开发模式下却没有.真的，最好的钩子是什么?是否有一个适用于所有环境的钩子?

I'm curious why the routes are loaded before after_initialize in test mode, but not in development mode. And really, what is the best hook for this? Is there a single hook that will work for all environments?

*编辑*

*EDIT*

mu 关于重新加载路线的建议很棒.它使我能够在所有环境中一致地访问 after_initialize 中的路由.不过，对于我的用例，我认为我仍然需要从 to_prepare 运行代码，因为我在模型上设置了一个类属性，并且模型在每次请求之前都会重新加载.

mu's suggestion of reloading the routes was great. It gave me consistent access to the routes within after_initialize in all environments. For my use case though, I think I still need to run the code from to_prepare as well, since I'm setting a class attribute on a model and the models are reloaded before each request.

这就是我最终要做的.

[:after_initialize, :to_prepare].each do |hook|
  config.send(hook) do
    User.invalid_usernames += Rails.application.routes.routes.map(&:path).join("
").scan(/s/(w+)/).flatten.compact.uniq
  end 
end 

我觉得有点乱.我想我宁愿做这样的事情:

It seems a bit messy to me. I think I'd rather do something like:

config.after_initialize do
  User.exclude_routes_from_usernames!
end

config.to_prepare do
  User.exclude_routes_from_usernames!
end

但我不确定 User 是否是检查 Rails.application.routes 的正确位置.我想我可以用 lib/中的代码做同样的事情，但我也不确定这是否正确.

But I'm not sure if User is the right place to be examining Rails.application.routes. I guess I could do the same thing with code in lib/ but I'm not sure if that's right either.

另一种选择是将 mu 的建议应用于 to_prepare.这行得通，但在我的开发环境中重新加载每个请求的路由似乎会有明显的延迟，所以我不确定这是否是一个好的调用，尽管它至少是 DRY.

Another option is to just apply mu's suggestion on to_prepare. That works but there seems to be a noticeable delay reloading the routes on every request in my dev environment, so I'm not sure if this is a good call, although it's DRY, at least.

config.to_prepare do
  Rails.application.reload_routes!
  User.invalid_usernames += Rails.application.routes.routes.map(&:path).join("
").scan(/s/(w+)/).flatten.compact.uniq
end

推荐答案

您可以在查看 Rails.application.routes 之前强制加载路由:

You can force the routes to be loaded before looking at Rails.application.routes with this:

Rails.application.reload_routes!

所以在你的 config/application.rb 中试试这个:

So try this in your config/application.rb:

config.after_initialize do
  Rails.application.reload_routes!
  Rails.logger.info "#{Rails.application.routes.routes.map(&:path)}"
end

我已经做了类似的事情来检查路由(与 /:slug 路由冲突)，我最终把 reload_routes! 和签入config.after_initialize 就像你正在做的那样.

I've done similar things that needed to check the routes (for conflicts with /:slug routes) and I ended up putting the reload_routes! and the checking in a config.after_initialize like you're doing.

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