Getting a list of classes that include a module

Question

I have a mixin for which I would like to get a list of all the classes that have included it. In the mixin module, I did the following:

module MyModule
  def         


        

Answer 1

module MyMod; end

class A; include MyMod; end
class B < A; end
class C; end

ObjectSpace.each_object(Class).select { |c| c.included_modules.include? MyMod }
  #=> [B, A]