有一种方法来获取所有的模型在你的Rails应用程序的集合？ [英] Is there a way to get a collection of all the Models in your Rails app?

问题描述

有一种方法，你可以得到所有的模型在你的Rails应用程序的集合？

Is there a way that you can get a collection of all of the Models in your Rails app?

基本上，我可以做类似的： -

Basically, can I do the likes of: -

Models.each do |model|
  puts model.class.name
end

推荐答案

编辑：查看评论和其他答案。有比这更聪明的答案！

Look at the comments and other answers. There are smarter answers than this one! Or try to improve this one as community wiki.

模型不会自己注册到主对象，所以没有，Rails没有模型列表。

Models do not register themselves to a master object, so no, Rails does not have the list of models.

但你仍然可以查看你的应用程序的models目录的内容...

But you could still look in the content of the models directory of your application...

Dir.foreach("#{RAILS_ROOT}/app/models") do |model_path|
  # ...
end

编辑：另一个是使用Ruby反射来搜索扩展ActiveRecord :: Base的每个类。不知道如何列出所有的类虽然...

Another (wild) idea would be to use Ruby reflection to search for every classes that extends ActiveRecord::Base. Don't know how you can list all the classes though...

编辑：只是为了好玩，我找到一种方法来列出所有类

Just for fun, I found a way to list all classes

Module.constants.select { |c| (eval c).is_a? Class }

编辑：最终成功列出所有模型，而不查看目录

Finally succeeded in listing all models without looking at directories

Module.constants.select do |constant_name|
  constant = eval constant_name
  if not constant.nil? and constant.is_a? Class and constant.superclass == ActiveRecord::Base
    constant
  end
end

如果你也想处理派生类，那么你将需要测试整个超类链。我通过添加一个方法到Class类：

If you want to handle derived class too, then you will need to test the whole superclass chain. I did it by adding a method to the Class class:

class Class
  def extend?(klass)
    not superclass.nil? and ( superclass == klass or superclass.extend? klass )
  end
end

def models 
  Module.constants.select do |constant_name|
    constant = eval constant_name
    if not constant.nil? and constant.is_a? Class and constant.extend? ActiveRecord::Base
    constant
    end
  end
end

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