MAPG-235 fixed place/map deletion

src/Repository/ChallengeRepository.php

@@ -3,6 +3,7 @@
 use Generator;
 use MapGuesser\Database\Query\Select;
 use MapGuesser\PersistentData\Model\Challenge;
+use MapGuesser\PersistentData\Model\Place;
 use MapGuesser\PersistentData\Model\User;
 use MapGuesser\PersistentData\PersistentDataManager;
 
@@ -55,4 +56,13 @@ class ChallengeRepository
 
         yield from $this->pdm->selectMultipleFromDb($select, Challenge::class);
     }
+
+    public function getAllByPlace(Place $place): Generator
+    {
+        $select = new Select(\Container::$dbConnection);
+        $select->innerJoin('place_in_challenge', ['challenges', 'id'], '=', ['place_in_challenge', 'challenge_id']);
+        $select->where('place_id', '=', $place->getId());
+
+        yield from $this->pdm->selectMultipleFromDb($select, Challenge::class);
+    }
 }