Re: Core Data Migration
Re: Core Data Migration
- Subject: Re: Core Data Migration
- From: Jerry Krinock <email@hidden>
- Date: Mon, 21 Dec 2009 17:56:24 -0800
On 2009 Dec 20, at 23:40, Chaitanya Pandit wrote:
> I'm working on the migration for one of my Core Data document based application
>
> One weird thing that is happening is that just after the "configurePersistentStoreCoordinatorForURL..." call, the contents of my document on the disk are changed ... i can no longer open that document in 1.0 as it has changed the data and it throws an alert saying the version of the model has been changed
But something else should happen, which is that, if the filename is, for example, SomeDoc.myapp, the original file will be copied to SomeDoc~.myapp. Note the tilde.
I've never seen this documented anywhere, though. Also, I've never tried to open such a migrated document with an earlier app version, but it would make sense that the earlier version would look for and automatically load the old tilde document if it couldn't load the current document due to model changed.
I recently had alot of trouble with Core Data migration, and saw alot of crap, but never saw a migration occur without the tilde doc appearing. If you figure out how you broke it, let us know. I'm worried that I might need to know someday ;)
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