From aa6bf6a363501f9836d2bb26a513c2ac3985de83 Mon Sep 17 00:00:00 2001
From: Baoshuo <i@baoshuo.ren>
Date: Mon, 30 Jan 2023 21:43:38 +0800
Subject: [PATCH] fix: 1e775d0d024c4e3d98a31c6074ab31cda15632d8

---
 web/app/upgrade/31_problem_resources/upgrade.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/web/app/upgrade/31_problem_resources/upgrade.php b/web/app/upgrade/31_problem_resources/upgrade.php
index f4f8c1f..8e4443f 100644
--- a/web/app/upgrade/31_problem_resources/upgrade.php
+++ b/web/app/upgrade/31_problem_resources/upgrade.php
@@ -6,8 +6,8 @@ return function ($type) {
 
 		$problems = DB::selectAll("select id from problems");
 
-		foreach ($problems as $id) {
-			mkdir(UOJContext::storagePath() . "/problem_resources/$id");
+		foreach ($problems as $row) {
+			mkdir(UOJContext::storagePath() . "/problem_resources/{$row['id']}");
 		}
 	}
 };