如何告诉Ruby不要序列化属性或如何正确重载marshal_dump? [英] How to tell Ruby not to serialize an attribute or how to overload marshal_dump properly?

问题描述

我的AR:B中有一个不可序列化的属性.

I have an attribute in my AR:B that is not serializeable.

o = Discussion.find(6)
Marshal.dump(o)

TypeError: no marshal_dump is defined for class Proc
       from (irb):10:in `dump'

我知道罪魁祸首，我想要将此变量设置为nil 在进行任何序列化之前.

I know the culprit and what I want is to set this variable to nil before any serialization takes place.

我可以做到这一点，但是我仍然坚持重写marshal_dump的正确方法

I can do this but I'm stuck with the proper way to override marshal_dump

 def marshal_dump
   @problem = nil
   # what is the right return here?
 end

还是有办法告诉Ruby或AR不要序列化对象?

Or is there is way to tell Ruby or AR not to serialize an object?

推荐答案

您的专用marshal_dump应该返回一个对象，其中包含要序列化的数据.该对象将在加载时传递回marshal_load.

Your specialized marshal_dump should return an object containing the data you want to serialize. That object will be passed back to marshal_load at load time.

在这种情况下，我假设您要转储的数据对应于所有AR属性(并且仅适用于那些属性)，所以我尝试:

In this case, I'm assuming the data you want to dump corresponds to all AR attributes (and only those), so I'd try:

def marshal_dump
  attributes
end

def marshal_load(data)
  send :attributes=, data, false  # false to override even protected attributes
end

这篇关于如何告诉Ruby不要序列化属性或如何正确重载marshal_dump?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！