将目录添加到 Rails 中的加载路径? [英] Adding a directory to the load path in Rails?

问题描述

从 Rails 2.3 开始，将目录添加到加载路径以使其与 Rails 的自动重新加载机制挂钩的正确方法是什么?

As of Rails 2.3, what's the right way to add a directory to the load path so that it hooks into Rails' auto-reloading mechanisms?

我想到的具体例子是我有一个类有几个使用 STI 的子类，我认为将它们放在一个子目录中而不是将顶级弄乱是个好主意.所以我会有类似的东西:

The specific example I'm thinking of is I have a class that has several sub-classes using STI and I thought it would be a good idea to put them in a sub-directory rather than clutter the top-level. So I would have something like:

#app/models/widget.rb
class Widget < ActiveRecord::Base
   add_to_load_path File.join(File.dirname(__FILE__), "widgets")
end

#app/models/widgets/bar_widget.rb
class BarWidget < Widget
end

#app/models/widgets/foo_widget.rb
class FooWidget < Widget
end

这是我正在寻找的 add_to_load_path 方法.

It's the add_to_load_path method that I'm looking for.

推荐答案

在当前版本的 Rails (3.2.8) 中，这已在 application.rb 文件中进行了更改.

In the current version of Rails (3.2.8), this has been changed in the application.rb file.

当前代码注释为:

  # Custom directories with classes and modules you want to be autoloadable.
  # config.autoload_paths += %W(#{config.root}/extras)

需要更新 autoload_paths 值.尝试修改之前的 load_paths 变量会导致此错误.

Will need to update the autoload_paths value. Attempting to modify the the former load_paths variable causes this error.

/configuration.rb:85:in `method_missing': undefined method `load_paths' for #<Rails::Application::Configuration:0xac670b4> (NoMethodError)

例如，对于要添加到 autoload_paths 配置的每个路径，添加类似于以下内容的行:

for an example, for each path to add to autoload_paths config, add a line similar to the following:

config.autoload_paths += %W(#{config.root}/app/validators)

<小时>

config.autoload_paths 接受一个路径数组，Rails 将从这些路径自动加载常量.默认为app下的所有目录.

---

config.autoload_paths accepts an array of paths from which Rails will autoload constants. Default is all directories under app.

http://guides.rubyonrails.org/configuring.html

来自以下评论者(hakunin):

From commentor (hakunin) below:

如果目录在 app/ 下，你不需要在任何地方添加它，它应该在默认情况下工作(肯定在 3.2.12 中).Rails 有 eager_load_paths 在开发中充当 autoload_paths，在生产中充当急切加载.所有 app/* 目录都会自动添加到那里.

If the directory is under app/, you don't need to add it anywhere, it should just work by default (definitely in 3.2.12). Rails has eager_load_paths that acts as autoload_paths in development, and eager load in production. All app/* directories are automatically added there.

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