Question

I am running an update thread which updates a table using coredata.
One of the records is called last-update. But when after the update is finished I retrieve the last-update value in the main thread I get an outdated value.

I do:

[NSFetchedResultsController deleteCacheWithName:nil];

before query-ing the setting again, but is there anything else I should/can do to alert the mainthread that it should check the physical table again?

Answer 1

It sounds like you’re not syncing the updates back into the main thread’s NSManagedObjectController. Try adding a method like this:

- (void)managedContextDidSave:(NSNotification *)n {
    if ([NSThread isMainThread]) {
        NSManagedObjectContext *context = /* Get context for main thread */;
        [context mergeChangesFromContextDidSaveNotification:n];
    } else {
        [self performSelectorOnMainThread:@selector(managedContextDidSave:) withObject:n waitUntilDone:YES];
    }
}

Then hook that up to the NSManagedObjectContextDidSaveNotification:

 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(managedContextDidSave:) name:NSManagedObjectContextDidSaveNotification object:nil];