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POImplementation of "Automatic Lightweight Migration" for Core Data (iPhone)
 

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    <p>I would like to make my app able to do an automatic lightweight migration when I add new attributes to my core data model.</p> <p>In the guide from Apple this is the only info on the subject I could find:</p> <blockquote> <p><strong>Automatic Lightweight Migration</strong></p> <p>To request automatic lightweight migration, you set appropriate flags in the options dictionary you pass in addPersistentStoreWithType:configuration:URL:options:error:. You need to set values corresponding to both the NSMigratePersistentStoresAutomaticallyOption and the NSInferMappingModelAutomaticallyOption keys to YES:</p> </blockquote> <pre><code>NSError *error; NSURL *storeURL = &lt;#The URL of a persistent store#&gt;; NSPersistentStoreCoordinator *psc = &lt;#The coordinator#&gt;; NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil]; if (![psc addPersistentStoreWithType:&lt;#Store type#&gt; configuration:&lt;#Configuration or nil#&gt; URL:storeURL options:options error:&amp;error]) { // Handle the error. } </code></pre> <p>My <code>NSPersistentStoreCoordinator</code> is initialized in this way:</p> <pre><code>- (NSPersistentStoreCoordinator *)persistentStoreCoordinator { if (persistentStoreCoordinator != nil) { return persistentStoreCoordinator; } NSURL *storeUrl = [NSURL fileURLWithPath: [[self applicationDocumentsDirectory] stringByAppendingPathComponent: @"FC.sqlite"]]; NSError *error = nil; persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]]; if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:nil error:&amp;error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } return persistentStoreCoordinator; } </code></pre> <p><strong>I am having trouble seeing where and how I should add the Apple code to get the Automatic Lightweight Migration working?</strong></p>
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