From e7f1fc8d04a01df61851a620d5a73cce23aefe6b Mon Sep 17 00:00:00 2001
From: cv <34649812+cpvalente@users.noreply.github.com>
Date: Wed, 21 Apr 2021 23:17:23 +0200
Subject: [PATCH] bugfix on optimist updates

---
 .../src/features/editors/list/EventListWrapper.jsx  | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/client/src/features/editors/list/EventListWrapper.jsx b/client/src/features/editors/list/EventListWrapper.jsx
index 92de1508b..f4d41ed48 100644
--- a/client/src/features/editors/list/EventListWrapper.jsx
+++ b/client/src/features/editors/list/EventListWrapper.jsx
@@ -30,13 +30,12 @@ export default function EventListWrapper() {
       const previousEvents = queryClient.getQueryData(eventsNamespace);
 
       // optimistically update object, temp ID until refetch
-
-      queryClient.setQueryData(eventsNamespace, (old) =>
-        old.splice(newEvent.order, 0, {
-          ...newEvent,
-          id: new Date().toISOString(),
-        })
-      );
+      let optimistic = [...previousEvents];
+      optimistic.splice(newEvent.order, 0, {
+        ...newEvent,
+        id: new Date().toISOString(),
+      });
+      queryClient.setQueryData(eventsNamespace, optimistic);
 
       // Return a context with the previous and new todo
       return { previousEvents };