Event: move validation to annotation and add UniqueEntity constraint on Participation

src/Bundle/ChillEventBundle/Entity/Participation.php

@@ -22,6 +22,7 @@ use Chill\MainBundle\Entity\Scope;
 use Chill\PersonBundle\Entity\Person;
 use DateTime;
 use Doctrine\ORM\Mapping as ORM;
+use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
 use Symfony\Component\Validator\Constraints as Assert;
 use Symfony\Component\Validator\Context\ExecutionContextInterface;
 
@@ -36,6 +37,7 @@ use Symfony\Component\Validator\Context\ExecutionContextInterface;
  *     })
  *
  * @ORM\HasLifecycleCallbacks
+ * @UniqueEntity({"event", "person"}, message="event.validation.person_already_participate_to_event")
  */
 class Participation implements \ArrayAccess, HasCenterInterface, HasScopeInterface, TrackUpdateInterface, TrackCreationInterface
 {
@@ -66,7 +68,6 @@ class Participation implements \ArrayAccess, HasCenterInterface, HasScopeInterfa
 
     /**
      * @ORM\ManyToOne(targetEntity="Chill\EventBundle\Entity\Role")
-     * @Assert\NotNull()
      */
     private ?Role $role = null;