https://symfony.com/doc/master/bundles/StofDoctrineExtensionsBundle/index.html
composer require stof/doctrine-extensions-bundle
//entity/mon_entity.php
use Gedmo\Mapping\Annotation as Gedmo;
/**
* @Gedmo\Slug(fields={"title", "code"})
* @ORM\Column(length=128, unique=true)
*/
private $slug;
php bin/console make:entity --regenerate