public function add()
{
$priority = $this->get_next_priority();
if ($this->get_priority() > $priority) {
$this->set_priority($priority);
}
if ($this->get_priority() < 1) {
$this->set_priority(1);
}
$sql = "UPDATE " . $this->table_name() . " " . "SET priority = priority + 1 " . "WHERE priority >= " . $this->get_priority();
global $wpdb;
$wpdb->query($sql);
parent::add();
}
