Missing Core Data Notifications

Question

I'm trying a multithreaded Core Data implementation on iPhone SDK 3.1.3. I have two different NSManagedObjectContext objects for each thread and I am registering for the change notifications on one thread like below:

- (void)setup {
    DLog(@"Registering for NSManagedObjectContext notifications");
    NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
    [nc addObserver:self selector:@selector(test:) name:@"NSManagedObjectContextWillSaveNotification" object:nil];
    [nc addObserver:self selector:@selector(test:) name:@"NSManagedObjectContextDidSaveNotification" object:nil];
    [nc addObserver:self selector:@selector(test:) name:@"NSManagedObjectContextObjectsDidChangeNotification" object:nil];
}

- (void)test:(NSNotification *)notif {
    DLog(@"Test callback");
}

In my other thread I am saving the second context like so:

NSError *error = nil;
[managedObjectContext save:&error];

if (error) {
    ALog(@"Error occured while trying to save a NewsStory object");
}
else {
    DLog(@"Saving context");
}

The notification callback method never gets executed though, which makes me believe these notifications are never posted?

My log shows the following:

Registering for NSManagedObjectContext notifications
Saving context
...
Saving context

Answer 1

Switch your @"NSManagedObjectContextWillSaveNotification" to NSManagedObjectContextWillSaveNotification. Those are constants. The events are most likely being posted but you are not listening for the right name.