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POLightweight migration with iCloud
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copied!<p>I have an app that can be run two ways: Using Local Storage or using iCloud. When I use local storage, my lightweight migration works fine, but when I choose iCloud, it causing all my data to be lost. Here is the code I use to initialize the persistent store coordinator:</p> <pre><code>NSMutableDictionary *options = [NSMutableDictionary dictionary]; NSFileManager *fm = [NSFileManager defaultManager]; NSURL *ubContainer = [fm URLForUbiquityContainerIdentifier:nil]; NSURL *logsDir = [ubContainer URLByAppendingPathComponent:@"logsDir"]; [options setObject:[NSNumber numberWithBool:YES] forKey:NSMigratePersistentStoresAutomaticallyOption]; [options setObject:[NSNumber numberWithBool:YES] forKey:NSInferMappingModelAutomaticallyOption]; if ([[NSUserDefaults standardUserDefaults] boolForKey:kUserDefaultsUseICloud]) { // Construct the dictionary that tells Core Data where the transaction log should be stored [options setObject:@"comcompanyappname" forKey:NSPersistentStoreUbiquitousContentNameKey]; [options setObject:logsDir forKey:NSPersistentStoreUbiquitousContentURLKey]; } // Read in xcdatamodeld model = [NSManagedObjectModel mergedModelFromBundles:nil]; psc = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:model]; NSURL *nosyncDir = [ubContainer URLByAppendingPathComponent:@"appname.nosync"]; NSURL *storeURL; if (ubContainer) { [fm createDirectoryAtURL:nosyncDir withIntermediateDirectories:YES attributes:nil error:nil]; storeURL = [nosyncDir URLByAppendingPathComponent:@"store.data"]; } else{ NSString *path = [self itemArchivePath]; storeURL = [NSURL fileURLWithPath:path]; } NSError *error = nil; [psc lock]; if (![psc addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error]) { [NSException raise:@"Open failed" format:@"Reason: %@", [error localizedDescription]]; } [psc unlock]; // Create the managed object context context = [[NSManagedObjectContext alloc] init]; [context setPersistentStoreCoordinator:psc]; [context setMergePolicy:NSMergeByPropertyObjectTrumpMergePolicy]; // The managed object context can manage undo, but we don't need it [context setUndoManager:nil]; </code></pre>

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