How to declare which methods should be defined in a subclass of an abstract class

abstract.rb

module Abstract
  def abstract_methods(*args)
    args.each do |name|
      class_eval(<<-END, __FILE__, __LINE__)
        def #{name}(*args)
          raise NotImplementedError.new("You must implement #{name}.")
        end
      END
    end
  end
end

class LineItem
  extend Abstract
  
  abstract_methods :name
end