Bug favorite merchant null

Builder/User/UserBuilder.php

 namespace Lc\CaracoleBundle\Builder\User;
 
 use Lc\CaracoleBundle\Factory\User\UserPointSaleFactory;
+use Lc\CaracoleBundle\Model\Merchant\MerchantInterface;
 use Lc\CaracoleBundle\Model\PointSale\PointSaleInterface;
 use Lc\SovBundle\Model\User\UserInterface;
 use Lc\SovBundle\Builder\User\UserBuilder as SovUserBuilder;
 {
 
     // linkUserToPointSale
-    public function linkToPointSale(UserInterface $user, PointSaleInterface $pointSale):bool
+    public function linkToPointSale(UserInterface $user, PointSaleInterface $pointSale): bool
     {
         if (!$this->userSolver->isLinkedToPointSale($user, $pointSale)) {
             $userPointSaleFactory = new UserPointSaleFactory();
 
         return false;
     }
+
+    public function setFavoriteMerchant(UserInterface $user, MerchantInterface $merchant)
+    {
+        $user->setFavoriteMerchant($merchant);
+        $this->entityManager->update($user);
+        $this->entityManager->flush();
+        return true;
+    }
 }