Lookitsatravis\Listify\Listify::incrementPositionsOnHigherItems PHP 메소드

    private function incrementPositionsOnHigherItems()
    {
        if ($this->isNotInList()) {
            return NULL;
        }
        $this->listifyList()->where($this->positionColumn(), '<', $this->getListifyPosition())->increment($this->positionColumn());
    }