Method getUserId

/**
 * Method to get a user object
 *
 * @param   string  $username  username
 *
 * @return  object
 *
 * @since   4.0.0
 */
protected function getUserId($username)
{
    $db = Factory::getDbo();
    $query = $db->getQuery(true)->select($db->quoteName('id'))->from($db->quoteName('#__users'))->where($db->quoteName('username') . '= :username')->bind(':username', $username);
    $db->setQuery($query);
    return $db->loadResult();
}