From: Jean-Hugues ROBERT <jean_hugues_robert@...>
Date: 2002-04-23T16:15:07+09:00
Subject: Re: Ruby as Smalltalk

Hello,

 >Oh, and I'd like become().  Of course, this
>Can you give an example where become() would be useful?
Example:
I save persistent data. Over my software versions, from time to time, the 
structure of data changes. I need to "migrate" object when a new version 
requires it. I there want to add/remove attributes/instance_var and change 
object's class to match the new schema (but I don't want to get into the 
trouble of fixing changed oid). How can I do that in Ruby ?

Yours,

Jean-Hugues