Question

Need some advice into: Can NSFetchedResultController do this?

UITableView:
  [section name] <= {entity: Section, value: title}
    [cell title] <= {entity: Cell, value: title}

Model:
  [entity: Section, properties: title] <->> [entity: Cell, properties: title, imgPath]

Trouble:
Count of sections, and their titles is working, can’t fetch object from relationship to Cell

Thanks for help…

Answer 1

That should be possible. In fact I think that you can use the “standard” table view data source methods and fetched results controller delegate methods if you create the FRC with the sectionNameKeyPath set to “section.title”:

// Fetch "Cell" entities:
NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"Cell"];

// First sort descriptor for grouping the cells into sections, sorted by section title:
NSSortDescriptor *sort1 = [NSSortDescriptor sortDescriptorWithKey:@"section.title" ascending:YES];
// Second sort descriptor for sorting the cells within each section:
NSSortDescriptor *sort2 = [NSSortDescriptor sortDescriptorWithKey:@"title" ascending:YES];
request.sortDescriptors = [NSArray arrayWithObjects:sort1, sort2, nil];

NSFetchedResultsController *frc = [[NSFetchedResultsController alloc]
                                        initWithFetchRequest:request
                                        managedObjectContext:context
                                          sectionNameKeyPath:@"section.title"
                                                   cacheName:nil];

(I have assumed that you have an inverse relationship section from the Cell entity to the Section entity.)