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    <p>This is what I did to make Automatic Lightweight Migration (Source: <a href="http://brainwashinc.wordpress.com/2010/01/18/iphone-coredata-automatic-light-migration/" rel="noreferrer">http://brainwashinc.wordpress.com/2010/01/18/iphone-coredata-automatic-light-migration/</a>)</p> <h3>1. Set the Persistent Store options for automatic migration in the app delegate.</h3> <p>Change your persistentStoreCoordinator creation to this (replace YOURDB):</p> <pre><code>- (NSPersistentStoreCoordinator *)persistentStoreCoordinator { if (persistentStoreCoordinator != nil) { return persistentStoreCoordinator; } NSURL *storeUrl = [NSURL fileURLWithPath: [[self applicationDocumentsDirectory] stringByAppendingPathComponent: @"YOURDB.sqlite"]]; // handle db upgrade NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil]; NSError *error = nil; persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]]; if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:options error:&amp;error]) { // Handle error } return persistentStoreCoordinator; } </code></pre> <h3>2. Version your Data Model and Edit the new file.</h3> <p>Select your xcdatamodel file Design -> Data Model -> Add Model Version (expand your xcdatamodeld item) Select the “2″ (or later) file, Design -> Data Model -> Set Current Version (edit this version)</p> <h3>3. Specify the momd resource in app delegate.</h3> <p>Change your managedObjectModel implementation to this (replace YOURDB)</p> <pre><code>- (NSManagedObjectModel *)managedObjectModel { if (managedObjectModel != nil) { return managedObjectModel; } NSString *path = [[NSBundle mainBundle] pathForResource:@"YOURDB" ofType:@"momd"]; NSURL *momURL = [NSURL fileURLWithPath:path]; managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:momURL]; return managedObjectModel; } </code></pre>
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    1. POImplementation of "Automatic Lightweight Migration" for Core Data (iPhone)
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    1. COHi Willi Thank you so much for taking the time to fill out all the gaps:)
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    2. COVery helpful! Thanks a bunch!
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    3. COI tried the above code and I get this error... *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSURL initFileURLWithPath:]: nil string parameter' any ideas?
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