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Re: Core Data migration

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Re: Core Data migration

Subject: Re: Core Data migration
From: Paul Collins <email@hidden>
Date: Sat, 20 Sep 2008 16:10:17 -0700

Back on March 29 2008, Mr. Wilson reported a problem with migration that I seem to be having now. To wit, a core data model that includes an abstract entity and entity inheritance fails to be migrated on OS X 10.5.

I'm getting different errors than he reported. I created a mapping model from the previous to the new data model. Finding, as Mr. Wilson did, a empty property mapping involving an abstract entity, I created a mapping for the abstract entity and related the property mapping to it.

When I attempt automatic migration (NSMigratePersistentStoresAutomaticallyOption), I get "Persistent store migration failed, missing mapping model." Alternatively, when I manually select the mapping model, NSMappingModel mappingMOdelFromBundles:forSourceModes:destinationModel: does give me my mapping model, but migrateStoreFromURL returns an NSError: Domain=NSCocoaErrorDomain Code=134110 UserInfo=0x80e25b0 "An error occured during persistent store migration."

If there's a workaround for this, I'd sure love to hear it.

Best regards,

Paul Collins
Gracion Software


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