From 3d1e6d5fed08691752cd09e7f68c808a74fd2229 Mon Sep 17 00:00:00 2001
From: Liang Ding <d@b3log.org>
Date: Fri, 5 Aug 2022 13:29:36 +0800
Subject: [PATCH] =?UTF-8?q?:art:=20API=20`setBlockAttrs`=20=E4=B8=AD?=
 =?UTF-8?q?=E5=A6=82=E6=9E=9C=E5=AD=98=E5=9C=A8=E5=B1=9E=E6=80=A7=E5=80=BC?=
 =?UTF-8?q?=E8=AE=BE=E7=BD=AE=E4=B8=BA=20`null`=20=E6=97=B6=E7=A7=BB?=
 =?UTF-8?q?=E9=99=A4=E8=AF=A5=E5=B1=9E=E6=80=A7=20Fix=20https://github.com?=
 =?UTF-8?q?/siyuan-note/siyuan/issues/5577?=
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---
 kernel/api/attr.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/api/attr.go b/kernel/api/attr.go
index af996f660..0c1d2dbcc 100644
--- a/kernel/api/attr.go
+++ b/kernel/api/attr.go
@@ -58,7 +58,11 @@ func setBlockAttrs(c *gin.Context) {
 	attrs := arg["attrs"].(map[string]interface{})
 	nameValues := map[string]string{}
 	for name, value := range attrs {
-		nameValues[name] = value.(string)
+		if nil == value { // API `setBlockAttrs` 中如果存在属性值设置为 `null` 时移除该属性 https://github.com/siyuan-note/siyuan/issues/5577
+			nameValues[name] = ""
+		} else {
+			nameValues[name] = value.(string)
+		}
 	}
 	err := model.SetBlockAttrs(id, nameValues)
 	if nil != err {