Core Data crash: Keypath Project not found in entity
core-data, nsfetchedresultscontroller, nsfetchrequest, objective-c, swift
Solution
The key used in the sort descriptor
[NSSortDescriptor sortDescriptorWithKey:@"Project" ascending:YES];
must be a property of your Core Data entity, not the name of the entity itself. So you should replace `@"Project"` in the sort descriptor by some property of the Project entity, such as `@"name"`.
Problem
``` - (void)fetchResult { NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"Project" ascending:YES]; [request setEntity:self.entityDescription]; [request setSortDescriptors:[NSArray arrayWithObject:sortDescriptor]]; self.fetchResultController = [[NSFetchedResultsController alloc] initWithFetchRequest:request managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:nil]; NSError *fetchError = nil; BOOL success = [self.fetchResultController performFetch:&fetchError]; if (success) { NSLog(@"fetched!"); } else { NSLog(@"fetch fail!"); } } ``` The entityDescription and the context is set in the viewDidLoad method, as it is shown below: ``` AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate]; self.managedObjectContext = appDelegate.managedObjectContext; self.entityDescription = [NSEntityDescription entityForName:@"Project" inManagedObjectContext:self.managedObjectContext]; ``` Crash info: * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'keypath Project not found in entity ' Could anybody give a hand?;)