Debugging NSFetchedResultsController

Question

Hi guys,

I've come into a strange situation with my NSFetchedResultsController. I've set it up with a predicate, and the sqlite3 table contains no entries when the app is loaded. Yet my controller sais that the one section in it contains two rows!

One section is fine:

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return [[fetchedResultsController sections] count];
}

But two rows???

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    id <NSFetchedResultsSectionInfo> sectionInfo = [[fetchedResultsController sections] objectAtIndex:section];
    return [sectionInfo numberOfObjects];
}   

If I instead did

return [[self.fetchedResultsController fetchedObjects] count];

that would be more correct, but why is the first way of doing it wrong? What would make it say two objects?

Cheers

Nik

Answer 1

What are the objects at index paths [0, 0] and [0, 1]? If it says there are two rows, maybe there are. Just because there's nothing in the database doesn't mean that there aren't objects in a managed object context that haven't been saved yet.

The first way of doing it is the correct way. The second way is wrong if you have multiple sections.