Feature: [activity][list] Fix list for activities and refactor list with an helper

src/Bundle/ChillMainBundle/Export/Helper/UserHelper.php

@@ -13,6 +13,8 @@ namespace Chill\MainBundle\Export\Helper;
 
 use Chill\MainBundle\Repository\UserRepositoryInterface;
 use Chill\MainBundle\Templating\Entity\UserRender;
+use function count;
+use const SORT_NUMERIC;
 
 class UserHelper
 {
@@ -40,4 +42,43 @@ class UserHelper
             return $this->userRender->renderString($user, []);
         };
     }
+
+    public function getLabelMulti($key, array $values, string $header): callable
+    {
+        return function ($value) {
+            if ('_header' === $value) {
+                return 'users name';
+            }
+
+            if (null === $value) {
+                return '';
+            }
+
+            $decoded = json_decode($value);
+
+            if (0 === count($decoded)) {
+                return '';
+            }
+
+            return
+                implode(
+                    '|',
+                    array_map(
+                        function (int $userId) {
+                            $user = $this->userRepository->find($userId);
+
+                            if (null === $user) {
+                                return '';
+                            }
+
+                            return $this->userRender->renderString($user, []);
+                        },
+                        array_unique(
+                            array_filter($decoded, static fn (?int $userId) => null !== $userId),
+                            SORT_NUMERIC
+                        )
+                    )
+                );
+        };
+    }
 }