无法使用 cache_classes = true 为关注点 (ActiveSupport::Concern::MultipleIncludedBlocks) 定义多个“包含"块

问题描述

我有一个在 Rails 4.1.1 应用程序中使用的模块

模块A扩展 ActiveSupport::关注包括做#一些代码结尾结尾

包含在一个类中

class 一些包括A结尾

这与 application.rb 中的 cache_classes=true 配合得很好.现在，如果我关闭类的缓存，我会在启动服务器时得到 Cannot define multiple 'included' blocks for a Concern (ActiveSupport::Concern::MultipleIncludedBlocks) 异常.

既然重新加载类是由 Rails 完成的，应该如何处理这样的问题?

解决方案

对于任何碰壁的人阅读，解决方案是严格遵守 Rails 自动加载规则.那是

1. 删除所有 require/require_relative
2. 将需要的路径添加到 Rails 自动加载路径
3. 使用正确的名称将文件放在正确的位置，以便 Rails 可以推断出在哪里查找要加载的代码.

更多信息在这里:https://github.com/rails/rails/issues/15767>

I have a certain module which is used in a Rails 4.1.1 application

module A
   extend ActiveSupport::Concern
   included do
     #Some code
   end
end

which is included in a class

class Some
  include A
end

This works great with cache_classes=true in application.rb. Now, if I turn off the caching of classes, I get Cannot define multiple 'included' blocks for a Concern (ActiveSupport::Concern::MultipleIncludedBlocks) exception upson starting the server.

How should one deal with such an issue since reloading the classes is done by Rails?

解决方案

For anyone hitting the same wall to read, the solution to this is to strictly respect Rails autoloading rules. That is

1. Removing all the require / require_relative
2. Add needed paths to Rails autoload paths
3. Put files at the right places with the right names so Rails can infer where to look for code to load.

More info here: https://github.com/rails/rails/issues/15767

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