Lookitsatravis\Listify\Listify::moveHigher PHP 메소드

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