Fix fields and add warning on content too long

src/Entity/Announce.php

@@ -6,6 +6,7 @@ use App\Entity\Document;
 use Doctrine\ORM\Mapping as ORM;
 use App\Repository\AnnounceRepository;
 use Gedmo\Mapping\Annotation as Gedmo;
+use Symfony\Component\Validator\Constraints as Assert;
 
 /**
  * @ORM\Entity(repositoryClass=AnnounceRepository::class)
@@ -13,8 +14,12 @@ use Gedmo\Mapping\Annotation as Gedmo;
 class Announce extends Document
 {
     /**
-     * @ORM\Column(type="text")
+     * @ORM\Column(type="text", length=65535)
      * @Gedmo\Versioned
+     * @Assert\Length(
+     *     max=65535,
+     *     maxMessage="Content too long : {{ limit }} max"
+     * )
      */
     private $content;