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I have two versions of my model Model001.xcdatamodel and Model002.xcdatamodel . These two are in the Model.xcdatamodeld bundle. I also have a Model001to002.xcmappingmodel which is not part of the Model.xcdatamodeld . I checked: both the xcmappingmodel and the xcdatamodeld get copied into the .app bundle. My managed object context is initialized like this: NSURL *documentModel = [bundle URLForResource:@"Model" withExtension:@"momd"]; managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:documentModel]; return managedObjectModel; I also set these properties on my overridden initWithFileURL: in my UIManagedObject subclass. NSMutableDictionary *options = [NSMutableDictionary dictionaryWithDictionary:self.persistentStoreOptions]; [options setObject:@YES forKey:NSMigratePersistentStoresAutomaticallyOption]; [options setObject:@YES forKey:NSInferMappingModelAutomaticallyOption]; self.persistentStoreOptions = [options copy]; But when I try to open a documet, I get the following error: Can't find mapping model for migration -- UPDATE -- Even if I do a manual migration [NSMappingModel mappingModelFromBundles:@[[NSBundle mainBundle]] forSourceModel:sourceObjectModel destinationModel:self.managedObjectModel]; this returns nil. Although I double checked that the Model001to002.cdm is in the app bundle. It has to be in the app bundle right?

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