如何在Ruby中动态更改继承 [英] How to dynamically alter inheritance in Ruby

问题描述

我想为Ruby中的类动态指定父类.考虑以下代码:

I would like to dynamically specify the parent class for a class in Ruby. Consider this code:

class Agent
  def self.hook_up(calling_class, desired_parent_class)
    # Do some magic here
  end
end

class Parent
  def bar
    puts "bar"
  end
end

class Child
  def foo
    puts "foo"
  end

  Agent.hook_up(self, Parent)
end

Child.new.bar

Parent和Child类定义均未指定父类，因此它们都继承自Object.我的第一个问题是:为了使Parent成为Child的超类，在Agent.hook_up中我需要做什么(例如，Child对象可以继承'bar'方法).

Neither the Parent nor the Child class definition specifies a parent class, so they both inherit from Object. My first question is: what would I need to do in Agent.hook_up in order to make Parent the superclass of Child (so for example Child objects can inherit the 'bar' method).

我的第二个问题是:我需要将第一个参数传递给Agent.hook_up，还是hook_up方法可以通过编程方式确定调用它的类的某种方式?

My second question is: do I need to pass the first argument to Agent.hook_up, or is there some way the hook_up method can programmatically determine the class from which it was called?

推荐答案

约书亚(Joshua)已经为您提供了大量替代方案，但要回答您的问题:创建类后，您无法更改类的超类在红宝石中.根本不可能.

Joshua has already given you a great list of alternatives, but to answer your question: You can't change the superclass of a class after the class has been created in ruby. That's simply not possible.

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