fix cs and add EntityToIdTransformer

src/Bundle/ChillCalendarBundle/Entity/Invite.php

@@ -18,6 +18,7 @@ use Chill\MainBundle\Doctrine\Model\TrackUpdateInterface;
 use Chill\MainBundle\Doctrine\Model\TrackUpdateTrait;
 use Chill\MainBundle\Entity\User;
 use Doctrine\ORM\Mapping as ORM;
+use LogicException;
 
 /**
  * @ORM\Table(name="chill_calendar.invite")
@@ -98,7 +99,7 @@ class Invite implements TrackUpdateInterface, TrackCreationInterface
     public function setUser(?User $user): self
     {
         if ($user instanceof User && $this->user instanceof User && $user !== $this->user) {
-            throw new \LogicException("Not allowed to associate an invite to a different user");
+            throw new LogicException('Not allowed to associate an invite to a different user');
         }
 
         $this->user = $user;