From 58259feb483d04a03a979f467ce6c3ee81b1068e Mon Sep 17 00:00:00 2001
From: cxt <853663049@qq.com>
Date: Fri, 28 Jun 2019 14:36:18 +0800
Subject: [PATCH] =?UTF-8?q?=E8=B0=83=E6=95=B4?=
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---
 app/models/homework_common.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/models/homework_common.rb b/app/models/homework_common.rb
index c0882ec6f..6512c3f1d 100644
--- a/app/models/homework_common.rb
+++ b/app/models/homework_common.rb
@@ -170,7 +170,7 @@ class HomeworkCommon < ApplicationRecord
   #删除时更新题库中的引用数
   def update_homework_bank_quotes
     old_bank = self.homework_bank
-    old_bank.update_attributes(quotes: (old_bank.quotes - 1) > 0 ? (old_bank.quotes - 1) : 0, homework_common_id: nil)
+    old_bank.update_attributes(quotes: (old_bank.quotes - 1) > 0 ? (old_bank.quotes - 1) : 0, homework_common_id: nil) if old_bank.present?
   end
 
   # 查重是否有新结果