Attachment.php

<?php
namespace App\Entity;

use Symfony\Component\HttpFoundation\File\File;

class Attachment
{
    /**
     * @param File|null $image
     * @throws \Exception
     */
    public function setMediaFile(File $image)
    {
        $this->mediaFile = $image;
        $this->setContentHash(md5_file($image-getPathname()));
    }
}