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copied!<p>I had the same problem and I've another solution - use a transient property for the sectionNameKeyPath i.e. category.sectionName. It seems that if you use a core data property as a sectionNameKeyPath it will try and sort with that.</p> <p>So using your example above:</p> <pre><code>NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"category.displayOrder" ascending:YES]; NSSortDescriptor *sortDescriptor2 = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES]; NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, sortDescriptor2, nil]; [fetchRequest setSortDescriptors:sortDescriptors]; NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:managedObjectContext sectionNameKeyPath:@"category.sectionName" cacheName:nil]; </code></pre> <p>Category.h:</p> <pre><code>@interface Category : NSManagedObject @property (nonatomic, retain) NSString* name; @property (nonatomic, retain) NSNumber* displayOrder; -(NSString*) sectionName; @end </code></pre> <p>Category.m:</p> <pre><code>@implementation Category @dynamic name; @dynamic displayOrder; -(NSString*) sectionName{ return self.name; } @end </code></pre> <p>Then in your view controller:</p> <pre><code>- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{ id<NSFetchedResultsSectionInfo> sectionInfo=[self.resultsController.sections objectAtIndex:section]; return sectionInfo.name; } </code></pre>

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