NSFetchedResultsController ignores fetchLimit?

Question

I have a NSFetchedResultsController to update a UITableView with content from Core Data. It\'s pretty standard stuff I\'m sure you\'ve all seen many times however I am runn

Answer 1

I know this is an old question, but I have a solution for it:

Since there is a known bug in NSFetchedResultsController that doesn't honor the fetchlimit of the NSFetchRequest, you have to manually handle the limiting of records within your UITableViewDataSource and NSFetchedResultsControllerDelegate methods.

tableView:numberOfRowsInSection:

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    id  sectionInfo = [[self.fetchedResultsController sections] objectAtIndex:section];

    NSInteger numRows = [sectionInfo numberOfObjects];

    if (numRows > self.fetchedResultsController.fetchRequest.fetchLimit) {

        numRows = self.fetchedResultsController.fetchRequest.fetchLimit;
    }

    return numRows;
}

controller:didChangeObject:atIndexPath:forChangeType:newIndexPath:

- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath {

    switch(type) {

        case NSFetchedResultsChangeInsert:

            if ([self.tableView numberOfRowsInSection:0] == self.fetchedResultsController.fetchRequest.fetchLimit) {
                //Determining which row to delete depends on your sort descriptors
                [self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:[NSIndexPath indexPathForRow:self.fetchedResultsController.fetchRequest.fetchLimit - 1 inSection:0]] withRowAnimation:UITableViewRowAnimationFade];

            }

            [self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath]
                            withRowAnimation:UITableViewRowAnimationFade];
        break;
        ...
    }
}