function save($object = '', $related_field = '')
{
if (!$this->exists()) {
$o = new Province();
$o->select_max('position');
$o->get();
if (count($o->all) != 0) {
$max = $o->position + 1;
$this->position = $max;
} else {
$this->postion = 1;
}
}
return parent::save($object, $related_field);
}