vendor/rails/activesupport/lib/active_support/core_ext/module/inclusion.rb

   1 class Module
   2   # Returns the classes in the current ObjectSpace where this module has been
   3   # mixed in according to Module#included_modules.
   4   #
   5   #   module M
   6   #   end
   7   #
   8   #   module N
   9   #     include M
  10   #   end
  11   #
  12   #   class C
  13   #     include M
  14   #   end
  15   #
  16   #   class D < C
  17   #   end
  18   #
  19   #   p M.included_in_classes # => [C, D]
  20   #
  21   def included_in_classes
  22     classes = []
  23     ObjectSpace.each_object(Class) { |k| classes << k if k.included_modules.include?(self) }
  24
  25     classes.reverse.inject([]) do |unique_classes, klass|
  26       unique_classes << klass unless unique_classes.collect { |k| k.to_s }.include?(klass.to_s)
  27       unique_classes
  28     end
  29   end
  30 end