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1. Add two methods to handle the notification. You want to create and add a new store when the old one has been removed.

- (void) didChangePersistentStores:(id)notification {
    NSArray *addedStores        = nil;
    NSArray *removedStores      = nil;
    NSArray *uuidChangedStores  = nil;
    
    addedStores = [[notification userInfo] valueForKey:NSAddedPersistentStoresKey];
    removedStores = [[notification userInfo] valueForKey:NSRemovedPersistentStoresKey];
    uuidChangedStores = [[notification userInfo] valueForKey:NSUUIDChangedPersistentStoresKey];

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-(void) recursiveSave:(NSManagedObjectContext *)context { 
  NSError *error = nil; 
  [context performBlock:{ 
    if (![context save:&error]){ 
      [self errorHandler:error]; 
    } else { 
      [self recursiveSave:[context parentContext]]; 
    } 
  }]; 
}

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// in the initializer, or viewWillAppear,etc:

[self addObserver:self forKeyPath:keyPath options:options context:(__bridge void*)self];

// in dealloc, or viewDidDisappear, etc:
[self removeObserver:self forKeyPath:keyPath context:(__bridge void*)self];


- (void) observeValueForKeyPath: (NSString *) keyPath ofObject: (id) object change: (NSDictionary *) change context: (void *) context {
    if ((__bridge id)context == self){

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context = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
[context setParentContext:someOtherContext];
result = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:context sectionNameKeyPath:nil cacheName:nil];

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- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller {
    [[NSOperationQueue mainQueue] addOperationWithBlock:^{
        [[self tableView] endUpdates];
    }];
}

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NSManagedObject *someObject = [[self fetchedResultsController] objectAtIndexPath:indexPath];
value = [someObject lastName];

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NSManagedObject *someObject = [[self fetchedResultsController] objectAtIndexPath:indexPath];
[[someObject managedObjectContext] performBlock:^{
    value = [someObject lastName];
}];

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- (void) tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
    NSManagedObject	*row	= [[self fetchedResultsController] objectAtIndexPath:indexPath];

    [[row managedObjectContext] performBlock:^{
        NSString	*text	= nil;

        // Fire a fault.
        text = [row lastName];
        // Update the user interface with the value.
        [[NSOperationQueue mainQueue] addOperationWithBlock:^{

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- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    NSManagedObjectContext  *rootContext                = nil;

    // Override point for customization after application launch.

    // 1. Create an NSManagedObjectContext with private queue concurrency
    rootContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
    // 2. Instantiate a concrete NSPersistentStore by adding it to the coordinator asynchronously.
    [rootContext performBlock:^{

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            // In your answer, you have this:
            
            NSManagedObjectID *objectID = [person objectID];

            dispatch_async(dispatch_get_main_queue(), ^{

                //update your UI here
                Person *thePerson = (Person *)[[delegate managedObjectContext] objectWithID:objectID];
                self.myUIElement.text = person.firstname;