public function findRoleNamesByUserId($userId)
    {
        $query = $this->getSqlObject()
            ->select()
            ->join('user_roles', 'user_roles.id = pvt_roles_users.role_id', ['name'])
            ->where(['user_id' => $userId]);

        $results = $this->execute($query)->toArray();

        return Arr::pluck($results, 'name');
    }