Fix fields and add warning on content too long

src/Entity/Folder.php

@@ -8,6 +8,7 @@ use App\Repository\FolderRepository;
 use Gedmo\Mapping\Annotation as Gedmo;
 use Doctrine\Common\Collections\Collection;
 use Doctrine\Common\Collections\ArrayCollection;
+use Symfony\Component\Validator\Constraints as Assert;
 
 /**
  * @ORM\Entity(repositoryClass=FolderRepository::class)
@@ -15,8 +16,12 @@ use Doctrine\Common\Collections\ArrayCollection;
 class Folder extends Document
 {
     /**
-     * @ORM\Column(type="text", nullable=true)
+     * @ORM\Column(type="text", length=65535)
      * @Gedmo\Versioned
+     * @Assert\Length(
+     *     max=65535,
+     *     maxMessage="Content too long : {{ limit }} max"
+     * )
      */
     private $content;