From 7c4b9951a94630dd0c68e1a9b9620836fb8cbbbc Mon Sep 17 00:00:00 2001
From: Valeri Karpov <val@karpov.io>
Date: Sat, 23 Feb 2019 20:36:59 -0500
Subject: [PATCH] fix(schema): handle nested objects with `_id: false`

Fix #7524
---
 lib/schema.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/schema.js b/lib/schema.js
index 361a01e0f46..fd7e197efae 100644
--- a/lib/schema.js
+++ b/lib/schema.js
@@ -396,7 +396,10 @@ Schema.prototype.add = function add(obj, prefix) {
     return;
   }
 
-  if (obj._id === false) {
+  // Special case: setting top-level `_id` to false should convert to disabling
+  // the `_id` option. This behavior never worked before 5.4.11 but numerous
+  // codebases use it (see gh-7516, gh-7512).
+  if (obj._id === false && prefix == null) {
     delete obj._id;
     this.options._id = false;
   }