Lookitsatravis\Listify\Listify::moveLower PHP 메소드

    public function moveLower()
    {
        if (!$this->lowerItem()) {
            return;
        }
        $this->getConnection()->transaction(function () {
            $this->lowerItem()->decrement($this->positionColumn());
            $this->increment($this->positionColumn());
        });
    }