Question

I successfully stored and retrieved a reference to an NSManagedObject using the example found in this site http://cocoawithlove.com/2008/08/safely-fetching-nsmanagedobject-by-uri.html

The problem is, the app crash whene triying to retrieve an NSManagedObject which has been deleted.

I tried the method isFault on the object, but it always returns no, even if the object IS there.

Here is my code I use to retrieve it:

NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSData *myData = [prefs objectForKey:@"activatedObject"];
if (myData)
{
    NSURL *myURL = [NSKeyedUnarchiver unarchiveObjectWithData:myData];
    NSManagedObjectID *myID = [self.persistentStoreCoordinator managedObjectIDForURIRepresentation:myURL];
    id myObject = [self.managedObjectContext objectWithID:myID];
    self.Object = myObject;
} 

Answer 1

You can try call this method:

NSError *error = nil;
id myObject = [self.managedObjectContext existingObjectWithID:myID error:&error];

If object specified by myID cannot be fetched, or does not exist, or cannot be faulted, it returns nil.