bug

app/Repositories/PostRepositories.php

@@ -383,9 +383,9 @@ class PostRepositories
                     $topicIds = json_decode($request['topic_ids'], true);
                     foreach ($topicIds as $key=>$id) {
                         if ($key==0) {
-                            $query->whereRaw('FIND_IN_SET('.$id.', topic_ids)');
+                            $query = $query->whereRaw('FIND_IN_SET('.$id.', topic_ids)');
                         } else {
-                            $query->orWhereRaw('FIND_IN_SET('.$id.', topic_ids)');
+                            $query = $query->orWhereRaw('FIND_IN_SET('.$id.', topic_ids)');
                         }
                     }
                 }