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核心数据，NSManagedObject 在应用版本之间发生变化

[英]core data, NSManagedObject changed between app versions

原文 2011-06-08 15:11:11 2 1 iphone/ core-data/ core-data-migration

I have an app at the App-Store right now that uses Core-Data with persistent store to save the data as SQL-Lite-store-type, locally on the device.我现在在 App-Store 有一个应用程序，它使用带有持久存储的 Core-Data 将数据保存为 SQL-Lite-store-type，在设备上本地保存。

Actually the Model is very simple, I have only one NSManagedObject in it, called "Product".其实Model很简单，我里面只有一个NSManagedObject，叫做“Product”。

In the next version I want to edit "Product" properties in the following way: add a new property and remove 5 properties.在下一个版本中，我想通过以下方式编辑“产品”属性：添加一个新属性并删除 5 个属性。 (Without the app crashing because of the inconsistency...) （没有应用程序因为不一致而崩溃......）

Plus, on the first launch of the application after the user upgrade I want to delete the old stored-DB , because it won't be relevant to the application any more.另外，在用户升级后第一次启动应用程序时，我想删除旧的 stored-DB ，因为它不再与应用程序相关。

I read "Core Data Model Versioning and Data Migration Programming Guide", but still not sure what is the best practice in this case.我阅读了“Core Data Model 版本控制和数据迁移编程指南”，但仍然不确定在这种情况下最佳实践是什么。 (Should I use "Lightweight Migration"?) （我应该使用“轻量级迁移”吗？）

Please help me...请帮我...

1 个解决方案

Using the Lightweight Migration is the simplest choice here.使用轻量级迁移是这里最简单的选择。 If all you are doing is adding properties, lightweight migration lets you avoid dealing with the inconsistency errors.如果您所做的只是添加属性，轻量级迁移可让您避免处理不一致错误。