A tiny example of how to use ruby idioms

moduleA.rb

module ModuleA

  def self.included(base)
    base.send :extend, ClassMethods
    base.send :include, InstanceMethods
  end

  module ClassMethods
    def my_method
      puts 'ModuleA#my_method'
    end
  end

  module InstanceMethods
    def batman
      puts 'ModuleA#new#batman'
    end
  end

end

moduleB.rb

module ModuleB

  def self.included(base)
    base.send :extend, ClassMethods
    base.send :include, InstanceMethods
  end

  module ClassMethods
    def other_method
      puts 'ModuleB#other_method'
    end
  end

  module InstanceMethods
    def superman
      puts 'ModuleB#new#superman'
    end
  end

end

ruby.rb

require_relative 'moduleA.rb'
require_relative 'moduleB.rb'

class MyClass
  include ModuleA
  include ModuleB
end

MyClass.my_method
MyClass.other_method
MyClass.new.superman
MyClass.new.batman