Rails为什么不从应用程序/服务自动加载类? [英] Why doesn't Rails autoload classes from app/services?

问题描述

我正在使用Rails 4.2应用程序，并且刚刚在结构中添加了app/services/fetch_artists.rb.在此文件中，我定义了class FetchArtists; end.

I'm working on a Rails 4.2 app and have just added app/services/fetch_artists.rb to the structure. Inside this file, I have defined a class FetchArtists; end.

当尝试运行rails r 'FetchArtists'时，它给了我NameError: uninitialized constant FetchArtists.

When trying to run rails r 'FetchArtists' it gives me a NameError: uninitialized constant FetchArtists.

我尝试查看ActiveSupport::Dependencies.autoload_paths，实际上，app/services不存在:

I've tried looking at ActiveSupport::Dependencies.autoload_paths and indeed, app/services is not there:

/.../app/assets
/.../app/controllers
/.../app/helpers
/.../app/jobs
/.../app/mailers
/.../app/models
/.../app/controllers/concerns
/.../app/models/concerns
/.../spec/mailers/previews

我的问题是，为什么不自动加载该文件夹，我应该怎么做?

My question is, why isn't this folder automatically loaded, and what should I do for it to be?

编辑

很奇怪，用rails runner重复运行上述命令后，新文件夹出现在自动加载路径上.我不知道为什么会发生这种滞后.

Very strange, after repeatedly running the above command with rails runner, the new folder appears on the autoload paths. I have no idea why this happened with such a lag.

有人建议这可能与spring有关.我想听到更多有关此的信息，因为在这种情况下它也可能会帮助许多其他人.

Someone suggested this may deal with spring. I would like to hear more on this, since it can possibly help many others in this situation too.

推荐答案

我遇到了同样的问题，并且似乎是Spring的缓存问题，该过程可以处理您的应用程序的预加载.它用于Web服务器以及控制台和Rake任务.

I encountered the same problem and it seems to be a caching issue with Spring, a process which handles preloading your app. It's used for the web server as well as the console and Rake tasks.

使用bin/spring stop停止Spring将强制Spring重新加载您的应用程序.现在运行rails console并检查ActiveSupport::Dependencies.autoload_paths将成功显示app/services.

Stopping Spring with bin/spring stop will force Spring to load your app fresh. Now running rails console and inspecting ActiveSupport::Dependencies.autoload_paths will successfully show app/services.

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