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    <p>In your persistentStoreCoordinator method give this line of code</p> <pre><code> NSDictionary *options=[NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES],NSMigratePersistentStoresAutomaticallyOption,[NSNumber numberWithBool:YES],NSInferMappingModelAutomaticallyOption, nil]; </code></pre> <p>If this doesnt help then you need to go for user implemented migration. So you will have to create a mapping model using source and destination model. In that case set,</p> <pre><code>NSDictionary *options=[NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES],NSMigratePersistentStoresAutomaticallyOption,[NSNumber numberWithBool:NO],NSInferMappingModelAutomaticallyOption, nil]; </code></pre> <p>Create douce metadata with following code</p> <pre><code>if (sourceMetadata) { NSString *configuration = nil; NSManagedObjectModel *destinationModel = [self.persistentStoreCoordinator managedObjectModel]; //Our Source 1 is going to be incompatible with the Version 2 Model, our Source 2 won't be... BOOL pscCompatible = [destinationModel isConfiguration:configuration compatibleWithStoreMetadata:sourceMetadata]; NSLog(@"Is the STORE data COMPATIBLE? %@", (pscCompatible==YES) ?@"YES" :@"NO"); if (pscCompatible == NO) { migrationSuccess = [self performMigrationWithSourceMetadata:sourceMetadata toDestinationModel:destinationModel]; } } else { NSLog(@"checkForMigration FAIL - No Source Metadata! \nERROR: %@", [error localizedDescription]); } </code></pre> <p>and implement the following function</p> <pre><code>- (BOOL)performMigrationWithSourceMetadata :(NSDictionary *)sourceMetadata toDestinationModel:(NSManagedObjectModel *)destinationModel { BOOL migrationSuccess = NO; //Initialise a Migration Manager... NSManagedObjectModel *sourceModel = [NSManagedObjectModel mergedModelFromBundles:nil forStoreMetadata:sourceMetadata]; //Perform the migration... if (sourceModel) { NSMigrationManager *standardMigrationManager = [[NSMigrationManager alloc] initWithSourceModel:sourceModel destinationModel:destinationModel]; //Retrieve the appropriate mapping model... NSMappingModel *mappingModel = [NSMappingModel mappingModelFromBundles:nil forSourceModel:sourceModel destinationModel:destinationModel]; if (mappingModel) { NSError *error = nil; NSString *storeSourcePath = [[self applicationDocumentsDirectory] stringByAppendingPathComponent:@"Recipes.sqlite"]; NSURL *storeSourceUrl = [NSURL fileURLWithPath: storeSourcePath]; NSString *storeDestPath = [[self applicationDocumentsDirectory] stringByAppendingPathComponent:@"Recipes2.sqlite"]; NSURL *storeDestUrl = [NSURL fileURLWithPath:storeDestPath]; //Pass nil here because we don't want to use any of these options: //NSIgnorePersistentStoreVersioningOption, NSMigratePersistentStoresAutomaticallyOption, or NSInferMappingModelAutomaticallyOption NSDictionary *sourceStoreOptions = nil; NSDictionary *destinationStoreOptions = nil; migrationSuccess = [standardMigrationManager migrateStoreFromURL:storeSourceUrl type:NSSQLiteStoreType options:sourceStoreOptions withMappingModel:mappingModel toDestinationURL:storeDestUrl destinationType:NSSQLiteStoreType destinationOptions:destinationStoreOptions error:&amp;error]; NSLog(@"MIGRATION SUCCESSFUL? %@", (migrationSuccess==YES)?@"YES":@"NO"); } } else { //TODO: Error to user... NSLog(@"checkForMigration FAIL - No Mapping Model found!"); abort(); } return migrationSuccess; } </code></pre>
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