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

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class Module

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  # Returns the classes in the current ObjectSpace where this module has been

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  # mixed in according to Module#included_modules.

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  #

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  #   module M

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  #   end

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  #   

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  #   module N

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  #     include M

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  #   end

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  #   

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  #   class C

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  #     include M

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  #   end

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  #   

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  #   class D < C

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  #   end

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  #

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  #   p M.included_in_classes # => [C, D]

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  #

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  def included_in_classes

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    classes = []

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    ObjectSpace.each_object(Class) { |k| classes << k if k.included_modules.include?(self) }

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    classes.reverse.inject([]) do |unique_classes, klass| 

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      unique_classes << klass unless unique_classes.collect { |k| k.to_s }.include?(klass.to_s)

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      unique_classes

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    end

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  end

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end

 

 

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