MAPG-235 queries with selected relations enabled; reduced size of some of the queries

src/Repository/UserInChallengeRepository.php

@@ -41,15 +41,20 @@ class UserInChallengeRepository
         return $this->pdm->selectFromDb($select, UserInChallenge::class);
     }
 
-    public function getByUserIdAndToken(int $userId, string $token_str): ?UserInChallenge
+    public function getByUserIdAndToken(int $userId, string $token_str, array $withRelations = []): ?UserInChallenge
     {
+        if (count($withRelations)) {
+            $necessaryRelations = [Challenge::class];
+            $withRelations = array_unique(array_merge($withRelations, $necessaryRelations));
+        }
+
         $token = hexdec($token_str);
 
         $select = new Select(\Container::$dbConnection);
         $select->where('user_id', '=', $userId);
         $select->where('token', '=', $token);
 
-        return $this->pdm->selectFromDb($select, UserInChallenge::class, true);
+        return $this->pdm->selectFromDb($select, UserInChallenge::class, true, $withRelations);
     }
 
     public function isUserParticipatingInChallenge(int $userId, Challenge $challenge): bool