private function bottomItem($except = NULL)
{
$conditions = $this->scopeCondition();
if ($except !== NULL) {
$conditions = $conditions . " AND " . $this->primaryKey() . " != " . $except->id;
}
$list = $this->listifyList()->whereNotNull($this->getTable() . "." . $this->positionColumn())->whereRaw($conditions)->orderBy($this->getTable() . "." . $this->positionColumn(), "DESC")->take(1)->first();
return $list;
}