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    <p>I've now found out that this is quite simple - once you know where to look.# 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 in xCode:</p> <pre><code>1. Select your xcdatamodeld file 2. Select the Editor Menu at the top - then choose Add Model Version 3. Now your xcdatamodeld file have two (modelname.xcdatamodel &amp; modelname2.xcdatamodel ) . 4. Now modelname.xcdatamodel have the green check mark implies it is current version, but we need to change the modelname2.xcdatamodel as a current version 5. Select the xcdatamodeld file and then select the View Menu at the top - then Choose Utilities - then Choose the Show File Inspector is shown in right side of Xcode and then Select the Versioned Core Data Model - have Current(DropDownList) - select modelname2(the one you just made current version have green check mark). 6. Now when you install this version onto a device that has the old model - it will automatically upgrade that model to the new model. </code></pre> <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>
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