From dedcb16fd7ae8211ca60bdf3630a0532525d3646 Mon Sep 17 00:00:00 2001
From: Tyler Schicke <tyler_schicke@brown.edu>
Date: Mon, 20 May 2019 04:36:53 -0400
Subject: Fixed deleting fields

---
 src/new_fields/util.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/new_fields/util.ts b/src/new_fields/util.ts
index 65a37a0d1..2b304c373 100644
--- a/src/new_fields/util.ts
+++ b/src/new_fields/util.ts
@@ -38,7 +38,11 @@ export const setter = action(function (target: any, prop: string | symbol | numb
         delete curValue[Parent];
         delete curValue[OnUpdate];
     }
-    target.__fields[prop] = value;
+    if (value === undefined) {
+        delete target.__fields[prop];
+    } else {
+        target.__fields[prop] = value;
+    }
     target[Update]({ '$set': { ["fields." + prop]: value instanceof ObjectField ? SerializationHelper.Serialize(value) : (value === undefined ? null : value) } });
     UndoManager.AddEvent({
         redo: () => receiver[prop] = value,
-- 
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