From bb85795934000e6bb1c5f50809cbda8c2175db85 Mon Sep 17 00:00:00 2001
From: Guo Xiang Tan <tgx_world@hotmail.com>
Date: Thu, 16 Mar 2017 11:33:55 +0800
Subject: [PATCH] FIX: Leave group membership button not updating.

https://meta.discourse.org/t/leave-group-button-on-groups-page-doesnt-give-any-feedback/57359/4
---
 .../discourse/components/group-membership-button.js.es6    | 2 +-
 .../components/group-membership-button-test.js.es6         | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/app/assets/javascripts/discourse/components/group-membership-button.js.es6 b/app/assets/javascripts/discourse/components/group-membership-button.js.es6
index a3de6d7ab0..83ad277df2 100644
--- a/app/assets/javascripts/discourse/components/group-membership-button.js.es6
+++ b/app/assets/javascripts/discourse/components/group-membership-button.js.es6
@@ -15,7 +15,7 @@ export default Ember.Component.extend({
 
   @computed("model.is_group_user", "model.id", "groupUserIds")
   userIsGroupUser(isGroupUser, groupId, groupUserIds) {
-    if (isGroupUser) {
+    if (isGroupUser !== undefined) {
       return isGroupUser;
     } else {
       return !!groupUserIds && groupUserIds.includes(groupId);
diff --git a/test/javascripts/components/group-membership-button-test.js.es6 b/test/javascripts/components/group-membership-button-test.js.es6
index b1796078d8..90831ec9c5 100644
--- a/test/javascripts/components/group-membership-button-test.js.es6
+++ b/test/javascripts/components/group-membership-button-test.js.es6
@@ -58,4 +58,11 @@ test('userIsGroupUser', function() {
   this.subject().set('groupUserIds', undefined);
 
   equal(this.subject().get('userIsGroupUser'), false);
+
+  this.subject().setProperties({
+    groupUserIds: [1, 3],
+    model: { id: 1, is_group_user: false }
+  });
+
+  equal(this.subject().get('userIsGroupUser'), false);
 });