Ensure single result when retrieving activity and event linked to stored object

Although a many-to-many relationship exists between these entities and stored object,
only one activity or event will ever be linked to a single stored object.
For extra safety measure we return a single result in the repository to ensure our voters
will keep working.

src/Bundle/ChillActivityBundle/Repository/ActivityRepository.php

@@ -17,6 +17,8 @@ use Chill\DocStoreBundle\Repository\AssociatedEntityToStoredObjectInterface;
 use Chill\PersonBundle\Entity\AccompanyingPeriod;
 use Chill\PersonBundle\Entity\Person;
 use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
+use Doctrine\ORM\NonUniqueResultException;
+use Doctrine\ORM\NoResultException;
 use Doctrine\Persistence\ManagerRegistry;
 
 /**
@@ -100,6 +102,10 @@ class ActivityRepository extends ServiceEntityRepository implements AssociatedEn
         return $qb->getQuery()->getResult();
     }
 
+    /**
+     * @throws NonUniqueResultException
+     * @throws NoResultException
+     */
     public function findAssociatedEntityToStoredObject(StoredObject $storedObject): ?object
     {
         $qb = $this->createQueryBuilder('a');
@@ -110,6 +116,6 @@ class ActivityRepository extends ServiceEntityRepository implements AssociatedEn
             ->setParameter('storedObjectId', $storedObject->getId())
             ->getQuery();
 
-        return $query->getResult();
+        return $query->getSingleResult();
     }
 }

src/Bundle/ChillEventBundle/Repository/EventRepository.php

@@ -16,6 +16,8 @@ use Chill\DocStoreBundle\Repository\AssociatedEntityToStoredObjectInterface;
 use Chill\EventBundle\Entity\Event;
 use Doctrine\ORM\EntityManagerInterface;
 use Doctrine\ORM\EntityRepository;
+use Doctrine\ORM\NonUniqueResultException;
+use Doctrine\ORM\NoResultException;
 use Doctrine\ORM\QueryBuilder;
 use Doctrine\Persistence\ObjectRepository;
 
@@ -36,6 +38,10 @@ class EventRepository implements ObjectRepository, AssociatedEntityToStoredObjec
         return $this->repository->createQueryBuilder($alias, $indexBy);
     }
 
+    /**
+     * @throws NonUniqueResultException
+     * @throws NoResultException
+     */
     public function findAssociatedEntityToStoredObject(StoredObject $storedObject): ?object
     {
         $qb = $this->createQueryBuilder('e');
@@ -46,7 +52,7 @@ class EventRepository implements ObjectRepository, AssociatedEntityToStoredObjec
             ->setParameter('storedObjectId', $storedObject->getId())
             ->getQuery();
 
-        return $query->getResult();
+        return $query->getSingleResult();
     }
 
     public function find($id)