Display managed object in two sections of NSFetchedResultsController - core-data

Question

I have an NSManagedObject which has three attributes:
Header (NSString *)
Title (NSString *)
Favorite (BOOL)
I'd like to display the list of these objects using the following scheme:
Favorites
Object 1
Object 3
A Header
Object 2
Object 3
B Header
Object 1
Object 4
Is there any way to do that using NSFetchedResultsController? I tried sorting it by favorite, header to no avail since once object is assigned to favorites section - it won't be displayed in section of its header. Is there any trick that I can use? Should I perform two fetches and reformat the results into one nested array?

Answer 1

Use two separate NSFetchedResultsController's
Then you need to account for this in each of the various delegate methods.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [[self.mainFetchedResultsController sections] count] + 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (section == 0) {
return [[[self.favFetchedResultsController sections] objectAtIndex:section] numberOfObjects];
} else {
return [[[self.mainFetchedResultsController sections] objectAtIndex:section - 1] numberOfObjects];
}
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
if (section == 0) {
return #"Favourites";
} else {
id <NSFetchedResultsSectionInfo> sectionInfo = [[self.mainFetchedResultsController sections] objectAtIndex:section - 1];
return [sectionInfo name];
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
Object *object = nil;
if (indexPath.section == 0) {
object = [self.favFetchedResultsController objectAtIndexPath:indexPath];
} else {
NSIndexPath *mainIndexPath = [NSIndexPath indexPathForRow:indexPath.row inSection:indexPath.section -1];
object = [self.mainFetchedResultsController objectAtIndexPath:mainIndexPath];
}
UITableViewCell *cell = ...
...
return cell;
}