Hi, I'm trying to create an index representing the first letter value of each record in a Core Data store to be used in a table view controller. I'm using a snippet of the code from Apple's documentation. I would simply like to produce an array or dictionary of distinct values as the result. My store already has the character defined within each record object. Questions:

1) I'm having a problem understanding NSDictionaryResultType. Where does the resulting dictionary object get received so that I can assign it's keys to the view controller? The code seems to only return an array.

2) If I include the line containing NSDictionaryResultType, I get no returns.

3) I realize that I could do this in a loop, but I'm hoping this will work.

Thanks!

 NSEntityDescription *entity = [NSEntityDescription  entityForName:@"People" inManagedObjectContext:managedObjectContext];

 NSFetchRequest *request = [[NSFetchRequest alloc] init];
 [request setEntity:entity];

        [request setResultType:NSDictionaryResultType]; // This line causes no no results.

 [request setReturnsDistinctResults:YES];
 [request setPropertiesToFetch :[NSArray arrayWithObject:@"alphabetIndex"]];

 NSError *error;
 NSArray *objects = [managedObjectContext executeFetchRequest:request error:&error];