如何将类包含在类中

如何获取类中包含的模块数组，不包括那些通过inheritance传入的模块？

请注意， ancestors ， included_modules将不起作用，因为它们的结果不区分包含在超类中预先添加的模块的模块。 换句话说，他们无法区分以下两种情况：

• M置于B的超类

   class A; end class B  [B, M, A, Object, Kernel, BasicObject] B  M # => -1 B.included_modules # => [M, Kernel] 

• M包含在B

   class A; end class B  [B, M, A, Object, Kernel, BasicObject] B  M # => -1 B.included_modules # => [M, Kernel] 

Answer 1

 mixed_in = B.included_modules[0...-B.superclass.included_modules.size] prepended = B.ancestors.take_while { |ancestor| ancestor != B } included = mixed_in - prepended