RLMException，对象类型需要迁移 [英] RLMException, Migration is required for object type

问题描述

我有一个对象NotSureItem，其中我有三个属性'title'，其名称从'text'和我之后添加的textDescription以及dateTime属性重命名。现在，当我要运行我的应用程序时，它会在我想要向这些属性添加内容时崩溃。它显示以下语句。

I have an object NotSureItem in which I have three property 'title' whose name is renamed from 'text' and textDescription which I had added later and a dateTime property. Now when I am going to run my app it crashes when I want to add something to these properties. It shows following statements.

'由于以下错误，对象类型'NotSureItem'需要迁移：
- 最新对象中缺少属性'text'模型。
- 属性标题已添加到最新的对象模型中。
- 属性'textDescription'已被添加到最新的对象模型。'

'Migration is required for object type 'NotSureItem' due to the following errors: - Property 'text' is missing from latest object model. - Property 'title' has been added to latest object model. - Property 'textDescription' has been added to latest object model.'

这是我的代码：

import Foundation
import Realm

class NotSureItem: RLMObject {
    dynamic var title = ""   // renamed from 'text'
    dynamic var textDescription = "" // added afterwards
    dynamic var dateTime = NSDate()
}

推荐答案

只需删除您的应用并再次运行。

Just delete your app and run it again.

每次更改您的Realm上的属性对象现有数据库与新数据库不兼容。

Everytime you change properties on your Realm objects your existing database becomes incompatible to the new one.

只要您还处于开发阶段，您只需从模拟器/设备中删除该应用程序并再次启动即可。

As long as you are still in the developing stage you can simply delete the app from the simulator / device and start it again.

稍后当您的应用程序发布并且您更改对象的属性时，您必须实现向新数据库版本的迁移。

Later when you app has been published and you change properties on your objects you have to implement a migration to the new database version.

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