I'm trying to do a custom core data migration, but I'm running into an issue 
getting the model for the older data:

    NSDictionary* metadata = [NSPersistentStoreCoordinator 
metadataForPersistentStoreOfType: NSSQLiteStoreType URL: storeURL error: &err];
    NSManagedObjectModel* sourceModel = [NSManagedObjectModel 
mergedModelFromBundles: nil forStoreMetadata: metadata];

metadata is valid, but sourceModel is nil.

I have several versions of the same model in my (iOS) app. According to the 
docs, passing nil here is the right thing to do.

Any ideas? Thanks!


-- 
Rick Mann
rm...@latencyzero.com



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