add validation of existing file

Entity/Document.php

@@ -6,7 +6,8 @@ use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
 use Chill\MainBundle\Entity\HasScopeInterface;
 use Chill\MainBundle\Entity\User;
-
+use ChampsLibres\AsyncUploaderBundle\Validator\Constraints\AsyncFileExists;
+use Symfony\Component\Validator\Constraints as Assert;
 
 /**
  * @ORM\MappedSuperclass()
@@ -22,6 +23,9 @@ class Document implements HasScopeInterface
 
     /**
      * @ORM\Column(type="text")
+     * @Assert\Length(
+     *  min=2, max=250
+     * )
      */
     private $title;
 
@@ -44,6 +48,7 @@ class Document implements HasScopeInterface
      *  targetEntity="Chill\DocStoreBundle\Entity\StoredObject",
      *  cascade={"persist"}
      * )
+     * @Assert\Valid()
      */
     private $object;