如何在 Ruby 中查找类的每个实例 [英] How to find each instance of a class in Ruby

问题描述

有没有办法在 Ruby 中获取某个类的所有对象?

Is there a way to get all the objects that are of a certain class in Ruby?

澄清:

class Pokemon
end

pikatchu = Pokemon.new
charmander = Pokemon.new

那么，有没有办法以某种方式检索引用这两个对象(pikatchu 和 charmander)?

So, is there a way I could somehow retrieve references those two objects (pikatchu and charmander)?

我实际上想通过 initialize 将它全部推入一个类数组中，但这可能会变大，我假设可能有一种原生的 Ruby 方法.

I actually thought of shoving it all into a class array via initialize, but that could potentially grow big, and I am assuming there might be a native Ruby approach to it.

推荐答案

解决方案是使用 ObjectSpace.each_object 方法如

The solution is to use ObjectSpace.each_object method like

ObjectSpace.each_object(Pokemon) {|x| p x}

产生

<Pokemon:0x0000010098aa70>
<Pokemon:0x00000100992158>
 => 2 

详细信息在 PickAxe 书籍第 25 章中讨论

Details are discussed in the PickAxe book Chapter 25

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