lists > pluck

src/Discussion/DiscussionRepository.php

@@ -53,7 +53,7 @@ class DiscussionRepository
         return Discussion::leftJoin('users_discussions', 'users_discussions.discussion_id', '=', 'discussions.id')
             ->where('user_id', $user->id)
             ->where('read_number', '>=', new Expression('last_post_number'))
-            ->lists('id')
+            ->pluck('id')
             ->all();
     }