I want a list of unique contacts that I've stored with core data.
NSEntityDescription *entityDescription = [NSEntityDescription entityForName:@"Post" inManagedObjectContext:[self managedObjectContext]];
NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];
[request setEntity:entityDescription];
NSDictionary *entityProperties = [entityDescription propertiesByName];
[request setPropertiesToFetch:[NSArray arrayWithObject:[entityProperties objectForKey:@"contactID"]]];
[request setReturnsDistinctResults:YES];
NSError *error = nil;
NSMutableArray *retValue = [[[self.managedObjectContext executeFetchRequest:request error:&error] mutableCopy] autorelease];
The result is always the same with or without the setPropertiesToFetch, so I guess there is something wrong with it, but I can't figure out what it is. Can someone help me?