Issue with Core Data Mapping Model
Issue with Core Data Mapping Model
- Subject: Issue with Core Data Mapping Model
- From: John Brayton <email@hidden>
- Date: Thu, 17 Jan 2013 21:45:51 -0500
Hi,
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.
Using git I've confirmed that the only file I am changing is the mapping model file; I am not changing the models themselves.
I would appreciate any thoughts on how to debug this further. Thank you.
John
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