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    <p>I've now found out that this is quite simple - once you know where to look.</p> <p>In my AppDelegate I set-up the NSPersistentStoreCoordinator - and you need to add some options to this to tell it to handle auto-migrate:</p> <pre><code>NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil]; NSError *error; _persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]]; if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:options error:&amp;error]) { // Handle error NSLog(@"Problem with PersistentStoreCoordinator: %@",error); } </code></pre> <p>Then you need to do a little trick in xCode:</p> <ol> <li>Select your xcdatamodel file</li> <li>Select the Design Menu at the top - then Data Model - then choose Add Model Version</li> <li>Your xcdatamodel file will then get moved into a new directory with the same name as your xcdatamodel file but with the extension xcdatamodeld - there will be a second file in this directory with a 2 in the name. Select the new file and then Design->Data Model->Set Current Version (<a href="https://stackoverflow.com/questions/5372479/xcode-4-core-data-model-version-set-current-version">in Xcode 4 you do this</a>)</li> <li>If you have already made the changes that have caused your project to be incompatible - take these changes out of the original xcdatamodel file. If you have yet to make the changes - then just edit the 2.xcdatamodel file (the one you just made current version).</li> <li>Now when you install this version onto a device that has the old model - it will automatically upgrade that model to the new model.</li> </ol> <p>This seems great and as simple as I wanted - but I think you need to be careful during development as you change a model - otherwise you will have to create a new version for each change. </p> <p>I think what I will do is that I will keep all of the changed files and then once I get ready to deploy my update I'll delete all the in-between files and just deploy with the oldest and latest models.</p> <hr> <p>UPDATE (15/07/2011):</p> <p>Thanks to @<a href="https://stackoverflow.com/users/623673/rockstarberlin">rockstarberlin</a> for pointing out there is updated documentation at apple:</p> <p><a href="http://developer.apple.com/library/mac/#recipes/xcode_help-core_data_modeling_tool/Articles/setting_current_version.html" rel="nofollow noreferrer">Xcode 4: Setting a Managed Object Model’s Current Version</a></p> <p>Update: 8/19/2013 better link:</p> <p><a href="https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/CoreDataVersioning/Articles/vmModelFormat.html" rel="nofollow noreferrer">https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/CoreDataVersioning/Articles/vmModelFormat.html</a></p>
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    1. POWhat do I have to do to get Core Data to automatically migrate models?
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    1. POWhat do I have to do to get Core Data to automatically migrate models?
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    1. COI'd suggesting reading the Core Data Migration and Versioning Guide, available in the Xcode doc viewer and on developer.apple.com.
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    2. COI didn't find the answer in there laid out simply - it took a while to find out how to do this.
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    3. CONSInferMappingModelAutomaticallyOption works well, but only for simple mappings, like changing the name of an attribute. For anything more complicated (relationships, removing or adding entities) you will need to add a mapping model. If Xcode complains that NSInferMappingModelAutomaticallyOption is undeclared, add #import <CoreData/CoreData.h> to your app delegate header file.
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      1. USElise van Looij
 

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