更改ActiveRecord类的类型Rails的单表继承 [英] Changing type of ActiveRecord Class in Rails with Single Table Inheritance

问题描述

我有两种类型的类：

BaseUser < ActiveRecord::Base 

和

User < BaseUser

这acts_as_authentic使用Authlogic的认证系统。这种继承是使用实现单表继承

which acts_as_authentic using Authlogic's authentication system. This inheritance is implemented using Single Table Inheritance

如果一个新的用户注册，我他注册一个用户。不过，如果我已经有相同的电子邮件中的BaseUser，我想这BaseUser更改为数据库中的用户，而不只是在复制所有数据从BaseUser用户，并创建一个新用户（即用新标识）。这可能吗？谢谢你。

If a new user registers, I register him as a User. However, if I already have a BaseUser with the same email, I'd like to change that BaseUser to a User in the database without simply copying all the data over to the User from the BaseUser and creating a new User (i.e. with a new id). Is this possible? Thanks.

推荐答案

您可以只设置类型字段，以用户，并保存记录。内存中的对象仍然显示为一个BaseUser但下一次重新载入内存中的对象将是一个用户

You can just set the type field to 'User' and save the record. The in-memory object will still show as a BaseUser but the next time you reload the in-memory object will be a User

>> b=BaseUser.new
>> b.class # = BaseUser

# Set the Type. In-Memory object is still a BaseUser
>> b.type='User'
>> b.class # = BaseUser
>> b.save

# Retrieve the records through both models (Each has the same class)

>> User.find(1).class # = User
>> BaseUser.find(1).class # User

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