如何在ruby中实现抽象类？

module AbstractClass
  def self.included(base)
    base.extend ClassMethods
  end

  module ClassMethods
    def abstract_method
      raise NotImplementedError.new("You must implement this method in your class")
    end
  end
end

class MyClass
  include AbstractClass

  def self.abstract_method
    # Your implementation here
  end
end