From 31ad004b64bff002cc8e3b918422ba9e157dc1d7 Mon Sep 17 00:00:00 2001
From: Valeri Karpov <val@karpov.io>
Date: Mon, 7 Sep 2020 16:37:24 -0400
Subject: [PATCH] fix(schema): support setting `_id` option to `false` after
 instantiating schema

Fix #9390
---
 lib/schema.js | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lib/schema.js b/lib/schema.js
index cbc1e80bd99..72410395747 100644
--- a/lib/schema.js
+++ b/lib/schema.js
@@ -1656,6 +1656,16 @@ Schema.prototype.set = function(key, value, _tags) {
       this.options[key] = value;
       this._userProvidedOptions[key] = this.options[key];
       break;
+    case '_id':
+      this.options[key] = value;
+      this._userProvidedOptions[key] = this.options[key];
+
+      if (value && !this.paths['_id']) {
+        addAutoId(this);
+      } else if (!value && this.paths['_id'] != null && this.paths['_id'].auto) {
+        this.remove('_id');
+      }
+      break;
     default:
       this.options[key] = value;
       this._userProvidedOptions[key] = this.options[key];