核心数据 - 提交应用商店更新

Question

Basically when I have an application in XCode and I change the sqlite/coredata database and try to run it on a device that already has the application on it then the app crashes. I have to remove the app and reinstall it.

I have updated the database on an app that has already been submitted to the app store. There has been about 100 downloads, and now I want to submit the update. Will people who have already downloaded it have problems with it? How would I make sure that they don't? There won't be any data in the old database that I will need to be honest, but I'm worried that the app just won't start at all.

Thanks Tom

Answer 1

From your description I can tell that you've changed the Managed Object Model withtout changing the store version.

Check out this tutorial (may be Mac version, but it should be valid) here .

However, if you with to omit the migration (since you said users won't exactly have any data in the store) you can always change the store path so that it loads another store. However, if you plan any updates and further developement of the app then i strongly recomend to read about core data migration.

Answer 2

Yes the app will probably crash when running with old db.

Apple released an interesting documentation about Core Data versioning and migration called: Core Data Model Versioning and Data Migration Programming Guide

If you read this document, you will learn how to avoid the crashes with updated coredata databases.