attr_accessor for Class Variables

attr_accessor_for_class_variables.rb

module XptoModule
  class << self
    attr_accessor :classes_with_xpto_module
  end

  self.classes_with_xpto_module = []

  def self.included(base)
    self.classes_with_xpto_module << base
  end
end

class XptoClassOne
  include XptoModule
end

class XptoClassTwo
  include XptoModule
end


XptoModule.classes_with_xpto_module # => [XptoClassOne, XptoClassTwo]

class XptoClassThree
  include XptoModule
end

XptoModule.classes_with_xpto_module # => [XptoClassOne, XptoClassTwo, XptoClassThree]