From 27e703f465eb0a1a84ac2dd6aeab4189ce2eb871 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=B0=8F=E9=AD=94=E7=8E=8B?=
 <40223749+LYErin@users.noreply.github.com>
Date: Fri, 2 Jul 2021 17:14:23 +0800
Subject: [PATCH] fix(collapse): defaultExpandedNames doesn't work in accrodion
 mode (#351)

---
 CHANGELOG.en-US.md                | 2 ++
 CHANGELOG.zh-CN.md                | 2 ++
 src/collapse/src/CollapseItem.tsx | 3 +++
 3 files changed, 7 insertions(+)

diff --git a/CHANGELOG.en-US.md b/CHANGELOG.en-US.md
index 2bdac78a9..1896b07f4 100644
--- a/CHANGELOG.en-US.md
+++ b/CHANGELOG.en-US.md
@@ -2,6 +2,8 @@
 
 ## Pending
 
+- Fix `n-collapse` the props of defaultExpandedNames does not work, closes [#350](https://github.com/TuSimple/naive-ui/issues/350).
+
 ### Breaking Changes
 
 - `n-select` add `render-tag` prop.
diff --git a/CHANGELOG.zh-CN.md b/CHANGELOG.zh-CN.md
index ffa469d24..bb3b4586c 100644
--- a/CHANGELOG.zh-CN.md
+++ b/CHANGELOG.zh-CN.md
@@ -2,6 +2,8 @@
 
 ## Pending
 
+- 修复 `n-collapse` 默认指定展开属性无效，关闭 [#350](https://github.com/TuSimple/naive-ui/issues/350)
+
 ### Breaking Changes
 
 - `n-select` 新增 `render-tag` 属性
diff --git a/src/collapse/src/CollapseItem.tsx b/src/collapse/src/CollapseItem.tsx
index 2cee5160b..b3b9b074b 100644
--- a/src/collapse/src/CollapseItem.tsx
+++ b/src/collapse/src/CollapseItem.tsx
@@ -49,6 +49,9 @@ export default defineComponent({
         return !~expandedNames.findIndex(
           (expandedName) => expandedName === name
         )
+      } else if (expandedNames) {
+        const { value: name } = mergedNameRef
+        return name !== expandedNames
       }
       return true
     })