public function __construct()
 {
     parent::__construct('pdo');
     //        $this->service = new PDOUserService($this->db);
 }
 public function __construct()
 {
     parent::__construct('mongo');
     $this->loadUsers();
 }
 public function __construct()
 {
     parent::__construct('mongo');
     $this->service = new MongoUserService($this->db);
 }