fix deleted discussion closes #13689

app/discussion/server/hooks/propagateDiscussionMetadata.js

@@ -26,3 +26,14 @@ callbacks.add('afterDeleteMessage', function(message, { _id, prid } = {}) {
 callbacks.add('afterDeleteRoom', function(rid) {
 	Rooms.find({ prid: rid }, { fields: { _id: 1 } }).forEach(({ _id }) => deleteRoom(_id));
 }, 'DeleteDiscussionChain');
+
+
+callbacks.add('afterDeleteRoom', function(drid) {
+	Messages.update({ drid }, {
+		$unset: {
+			dcount: 1,
+			dlm: 1,
+			drid: 1,
+		},
+	});
+}, 'CleanDiscussionMessage');

server/startup/migrations/index.js

@@ -137,4 +137,5 @@ import './v136';
 import './v137';
 import './v138';
 import './v139';
+import './v140';
 import './xrun';

server/startup/migrations/v140.js

@@ -0,0 +1,17 @@
+import { Migrations } from '../../../app/migrations/server';
+
+import { Messages, Rooms } from '../../../app/models/server';
+
+Migrations.add({
+	version: 140,
+	up() {
+		Messages.find({ drid: { $exists: 1 } }, { fields: { drid: 1 } }).forEach(({ _id, drid }) => Rooms.findOne({ _id: drid }) || Messages.update({ _id }, {
+			$unset: {
+				drid: 1,
+				dcount: 1,
+				dlm: 1,
+				t: 1,
+			},
+		}));
+	},
+});