diff --git a/src/Bundle/ChillMainBundle/DependencyInjection/ChillMainExtension.php b/src/Bundle/ChillMainBundle/DependencyInjection/ChillMainExtension.php
index 6826f854c..1637ee098 100644
--- a/src/Bundle/ChillMainBundle/DependencyInjection/ChillMainExtension.php
+++ b/src/Bundle/ChillMainBundle/DependencyInjection/ChillMainExtension.php
@@ -32,9 +32,8 @@ use Chill\MainBundle\Doctrine\DQL\JsonAggregate;
 use Chill\MainBundle\Doctrine\DQL\JsonbExistsInArray;
 use Chill\MainBundle\Doctrine\DQL\Similarity;
 use Chill\MainBundle\Doctrine\DQL\OverlapsI;
-use Symfony\Component\DependencyInjection\Definition;
-use Symfony\Component\DependencyInjection\Reference;
 use Chill\MainBundle\Doctrine\DQL\Replace;
+use Chill\MainBundle\Doctrine\ORM\Hydration\FlatHierarchyEntityHydrator;
 use Chill\MainBundle\Doctrine\Type\NativeDateIntervalType;
 use Chill\MainBundle\Doctrine\Type\PointType;
 use Symfony\Component\HttpFoundation\Request;
@@ -186,6 +185,9 @@ class ChillMainExtension extends Extension implements PrependExtensionInterface,
                                 'OVERLAPSI' => OverlapsI::class,
                             ],
                         ],
+                        'hydrators' => [
+                            'chill_flat_hierarchy_list' => FlatHierarchyEntityHydrator::class,
+                        ],
                     ],
                 ],
         );
diff --git a/src/Bundle/ChillMainBundle/Doctrine/ORM/Hydration/FlatHierarchyEntityHydrator.php b/src/Bundle/ChillMainBundle/Doctrine/ORM/Hydration/FlatHierarchyEntityHydrator.php
new file mode 100644
index 000000000..c389b543d
--- /dev/null
+++ b/src/Bundle/ChillMainBundle/Doctrine/ORM/Hydration/FlatHierarchyEntityHydrator.php
@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Chill\MainBundle\Doctrine\ORM\Hydration;
+
+use Doctrine\ORM\Internal\Hydration\ObjectHydrator;
+use Generator;
+
+final class FlatHierarchyEntityHydrator extends ObjectHydrator
+{
+    public const LIST = 'chill_flat_hierarchy_list';
+
+    protected function hydrateAllData()
+    {
+        return array_values(iterator_to_array($this->flatListGenerator($this->buildChildrenHashmap(parent::hydrateAllData()))));
+    }
+
+    private function flatListGenerator(array $hashMap, ?object $parent = null): Generator
+    {
+        $parent = null === $parent ? null : spl_object_id($parent);
+        $hashMap += [$parent => []];
+
+        foreach ($hashMap[$parent] as $node) {
+            yield spl_object_id($node) => $node;
+            yield from $this->flatListGenerator($hashMap, $node);
+        }
+    }
+
+    private function buildChildrenHashmap(array $nodes): array
+    {
+        return array_reduce(
+            $nodes,
+            static function (array $collect, $node): array {
+                $parentId = (null === $parent = $node->getParent()) ?
+                    null :
+                    spl_object_id($parent);
+
+                $collect[$parentId][] = $node;
+
+                return $collect;
+            },
+            []
+        );
+    }
+
+}
diff --git a/src/Bundle/ChillPersonBundle/Controller/SocialIssueApiController.php b/src/Bundle/ChillPersonBundle/Controller/SocialIssueApiController.php
index 40d7068ce..c1d251efb 100644
--- a/src/Bundle/ChillPersonBundle/Controller/SocialIssueApiController.php
+++ b/src/Bundle/ChillPersonBundle/Controller/SocialIssueApiController.php
@@ -3,8 +3,12 @@
 namespace Chill\PersonBundle\Controller;
 
 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;
 
 class SocialIssueApiController extends ApiController
 {
@@ -16,6 +20,25 @@ class SocialIssueApiController extends ApiController
                 $query->expr()->isNull('e.desactivationDate')
             )
         );
-        $query->setParameter('now', new \DateTimeImmutable());
+        $query->setParameter('now', new DateTimeImmutable());
+    }
+
+    protected function getQueryResult(string $action, Request $request, string $_format, int $totalItems, PaginatorInterface $paginator, $query)
+    {
+        // In order to work, this hydrator only works with
+        // entities having the field "children" set up.
+        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
+    {
+        $query
+            ->orderBy("GET_JSON_FIELD_BY_KEY(e.title, :locale)", 'ASC')
+            ->setParameter(':locale', $request->getLocale());
+
+        return null;
     }
 }