查找模块中可用的类 [英] Find classes available in a Module

问题描述

我有一个模块MyModule.我动态地将类加载到其中.如何获得在其命名空间中定义的类的列表?

I have a module MyModule. I dynamically load classes into it. How can I get a list of the classes defined within its namespace?

示例:

def load_plugins
  Dir.glob(File.dirname(__FILE__) + '/plugins/*.rb') do |f|
    MyModule.class_eval File.read(f)
  end

  # now how can I find the new classes I've loaded into MyModule?
end

我应该说每个f都包含类似"Foo类；结束"的内容.

I should say that each f contains something like "class Foo; end".

您也可以这样想:在Rails中，如何以编程方式找到ActiveRecord模块中定义的所有类?

You can also think of it like this: in Rails, how could I programatically find all classes defined within the ActiveRecord module?

推荐答案

通过常量访问类.在模块中定义的类在该模块中被列为常量.因此，您只需要选择引用类的常量即可.

Classes are accessed through constants. Classes defined within a module are listed as constants in that module. So you just need to choose the constants that refer to classes.

MyModule.constants.select {|c| MyModule.const_get(c).is_a? Class}

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