Re: Issue with Core Data Mapping Model
Re: Issue with Core Data Mapping Model
- Subject: Re: Issue with Core Data Mapping Model
- From: Sean McBride <email@hidden>
- Date: Tue, 22 Jan 2013 12:12:10 -0500
- Organization: Rogue Research Inc.
On Thu, 17 Jan 2013 21:45:51 -0500, John Brayton said:
>I am building a mapping model between two versions of my Core Data
>model, and I am encountering a strange issue:
>
>* If I define six of the seven entity mappings I need in the mapping
>model, migrating the data works as expected.
>
>* When I add the seventh entity mapping, the migration fails with this error:
> Persistent store migration failed, missing mapping model.
>
>* If I delete that seventh entity mapping, the migration works again.
>
>* I am trying to do the migration by calling addPersistentStoreWithType:
>… on the NSPersistentStoreCoordinator.
>
>* Reading in both the source and destination models with
>NSManagedObjectModel initWithContentsOfURL:... works as expected.
>
>* Reading in the NSMappingModel with initWithContentsOfURL:… works as
>expected.
>
>* With the seventh entity mapping added, reading in the mapping model
>with [NSMappingModel mappingModelFromBundles:@[bundle]
>forSourceModel:source destinationModel:dest] returns null.
This sounds a lot like something I am seeing. Do you see hash mismatches like described here:
<http://stackoverflow.com/questions/10894383/core-data-mapping-model-version-hashes-not-matching-to-source-model-version-hash>
I've spent hours on it, and as best as I can tell Xcode is generating invalid xcmappingmodel files. Just the other day I've used a DTS incident on this, but have not heard back yet. I'll follow up in this thread when I do.
Cheers,
--
____________________________________________________________
Sean McBride, B. Eng email@hidden
Rogue Research www.rogue-research.com
Mac Software Developer Montréal, Québec, Canada
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