I had a similar problem with one of my apps, when the Apple released the new iOS 4.0. Search: fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:[self managedObjectContext] sectionNameKeyPath:nil cacheName:nil]; And set the value of the parameter cacheName to nil. It worked for me, hope it will for you. Let me know.
For what it’s worth, Marcus Zarra seems to be promoting the nil context approach, claiming that it’s expensive to create a new context. For more details, see this answer to a similar question. Update I’m currently using the nil context approach and have encountered something that might be of interest to others. To create a … Read more
You should probably save the master MOC in strides as well. No sense having that MOC wait until the end to save. It has its own thread, and it will help keep memory down as well. You wrote: Then at the end of the import process, I save on the master/parent context which, ostensibly, pushes … Read more
Given a NSDate * startDate and endDate and a NSManagedObjectContext * moc: NSPredicate *predicate = [NSPredicate predicateWithFormat:@”(date >= %@) AND (date <= %@)”, startDate, endDate]; NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease]; [request setEntity:[NSEntityDescription entityForName:@”EntityName” inManagedObjectContext:moc]]; [request setPredicate:predicate]; NSError *error = nil; NSArray *results = [moc executeFetchRequest:request error:&error];