public static function deleteKshow(kshow $kshow)
{
$kuser = $kshow->getKuser();
// this might happen when creating a temp kshow without setting its producer
if ($kuser == NULL) {
return;
}
$v = $kuser->getProducedKshows();
self::dec($v);
$kuser->setProducedKshows($v);
self::add($kuser);
}