From 978d695fb2f2714cc6c87978c560abda7b71de12 Mon Sep 17 00:00:00 2001
From: Valeri Karpov <val@karpov.io>
Date: Sun, 4 Oct 2020 13:24:52 -0400
Subject: [PATCH] fix(schema): handle setting nested paths underneath single
 nested subdocs

Fix #9459
---
 lib/schema.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/lib/schema.js b/lib/schema.js
index 07f760453ac..1ad65525857 100644
--- a/lib/schema.js
+++ b/lib/schema.js
@@ -715,6 +715,9 @@ Schema.prototype.path = function(path, obj) {
       this.singleNestedPaths[path + '.' + key] =
         schemaType.schema.subpaths[key];
     }
+    for (const key in schemaType.schema.nested) {
+      this.singleNestedPaths[path + '.' + key] = 'nested';
+    }
 
     Object.defineProperty(schemaType.schema, 'base', {
       configurable: true,
@@ -1124,8 +1127,10 @@ Schema.prototype.pathType = function(path) {
   if (this.subpaths.hasOwnProperty(cleanPath) || this.subpaths.hasOwnProperty(path)) {
     return 'real';
   }
-  if (this.singleNestedPaths.hasOwnProperty(cleanPath) || this.singleNestedPaths.hasOwnProperty(path)) {
-    return 'real';
+
+  const singleNestedPath = this.singleNestedPaths.hasOwnProperty(cleanPath) || this.singleNestedPaths.hasOwnProperty(path);
+  if (singleNestedPath) {
+    return singleNestedPath === 'nested' ? 'nested' : 'real';
   }
 
   // Look for maps