Core Data distinct in Swift

var appDelegate = UIApplication.sharedApplication().delegate as AppDelegate
var context: NSManagedObjectContext = appDelegate.managedObjectContext!
var user: AnyObject = NSEntityDescription.insertNewObjectForEntityForName("Hadiths", inManagedObjectContext: context)

var request = NSFetchRequest(entityName: "Hadiths")
var entity = NSEntityDescription.entityForName("Hadiths", inManagedObjectContext: context)
request.resultType = NSFetchRequestResultType.DictionaryResultType
request.propertiesToFetch = (entity!.propertiesByName)["name"] as NSArray
request.returnsDistinctResults = true