object.valueforKey("key")

object.key

let realm = try! Realm()
        let predicate = NSPredicate(format: "groupID = %@", group.valueForKey("groupID") as! String )
        let current = realm.objects(apiGroup).filter(predicate)
        let currentGroup = current[0]
        print(currentGroup.valueForKey("token") as! String
        print(currentGroup.token)