Airship\Cabin\Bridge\Blueprint\UserAccounts::getUserIDByUsername PHP Method

    public function getUserIDByUsername(string $username) : int
    {
        $userId = $this->db->cell('SELECT
                 userid
             FROM
                 airship_users
             WHERE
                 username = ?', $username);
        if (empty($userId)) {
            throw new UserNotFound();
        }
        return $userId;
    }