gistfile1.rb

module IncludeAttr
  def self.included(klass)
    klass.instance_eval do
      class << self
        attr_accessor :random_attribute
      end
    end
  end
end

# and then i have this somewhere:

class RandomClass
  include IncludeAttr
end

# if i do something like:


RandomClass.random_attribute = 5