Rails 库目录 [英] Rails lib directory

问题描述

关于lib目录的问题.

Question about lib directory.

使用 lib 目录有哪些好的做法?
什么时候应该在应用程序/模型或应用程序/助手上使用它?
与如何让 Rails 3 包含 lib 目录中的文件有些相关?

What are good practices in using the lib directory?
When should it be used over app/models or app/helpers?
And somewhat related how do you get Rails 3 to include files from the lib directory?

谢谢

推荐答案

lib 目录的一个用途(我最常使用它的方式)是在模型之间共享代码以保持 DRY.例如，如果您要在许多不同模型上定义 tag_tokens 属性以与标记器输入一起使用，您可以将其放在tag_accessor.rb"或其他内容中，将其放在 /lib'，然后用 include TagAccessor 包含它.ruby 文件可能如下所示:

One use of the lib directory (how I use it most often) is to share code between models to stay DRY. For example, if you are defining a tag_tokens attribute on many different models for use with a tokenizer input, you could put that in "tag_accessor.rb" or something, place it in /lib', and then include it with include TagAccessor. The ruby file might look like:

module TagAccessor
  def tag_tokens
    tags.map(&:name).join(',')
  end

  def tag_tokens=(names)
    self.tag_ids = names.split(",").uniq
  end
end

(这是我的一个应用程序中的一个示例，这就是它如此具体的原因).然后在 Rails 3 中加载/lib 文件夹，把它放在你的 application.rb 中:

(This is an example from one of my apps, which is why it's so specific). Then to load the /lib folder in Rails 3, place this in your application.rb:

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

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