NSPredicate: Fetch one of each kind

Question

I want to create an NSFetchRequest for objects like this:

The Object is Car which has an attribute color

Answer 1

Did you tried to use valueForKeyPath ? You can do something like that in the array that NSPredicate provide to you.

NSArray* distinctColors = [cars valueForKeyPath:@"@distinctUnionOfObjects.color"];

It will return to you the distinct colors that you have, I do not know if it is what you want, but with the colors you can do something like @Anupdas told: