Prevent multiples sub-queries.

src/Bundle/ChillMainBundle/Doctrine/ORM/Hydration/FlatHierarchyEntityHydrator.php

@@ -15,7 +15,13 @@ final class FlatHierarchyEntityHydrator extends ObjectHydrator
     {
         $generator = $this->buildRecursively(
             parent::hydrateAllData(),
-            static fn($value): iterable => $value->getChildren(),
+            static function($value): iterable {
+                $children = $value->getChildren();
+
+                $children->setInitialized(true);
+
+                return $children;
+            }
         );
 
         $result = [];

src/Bundle/ChillPersonBundle/Controller/SocialIssueApiController.php

@@ -6,6 +6,7 @@ use Chill\MainBundle\CRUD\Controller\ApiController;
 use Chill\MainBundle\Doctrine\ORM\Hydration\FlatHierarchyEntityHydrator;
 use Chill\MainBundle\Pagination\PaginatorInterface;
 use DateTimeImmutable;
+use Doctrine\ORM\Query;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 
@@ -26,7 +27,10 @@ class SocialIssueApiController extends ApiController
     {
         // In order to work, this hydrator only works with
         // entities having the field "children" set up.
-        return $query->getQuery()->getResult(FlatHierarchyEntityHydrator::LIST);
+        return $query
+            ->getQuery()
+            ->setHint(Query::HINT_INCLUDE_META_COLUMNS, true)
+            ->getResult(FlatHierarchyEntityHydrator::LIST);
     }
 
     protected function onPostIndexBuildQuery(string $action, Request $request, string $_format, int $totalItems, PaginatorInterface $paginator, $query): ?Response