From 803090d3e31d780b7b9533dda85791143929e1ba Mon Sep 17 00:00:00 2001
From: Valeri Karpov <val@karpov.io>
Date: Tue, 7 Jan 2020 21:40:55 -0500
Subject: [PATCH] fix(schema): make aliases handle mongoose-lean-virtuals

Backport fix for #6069 and vkarpov15/mongoose-lean-virtuals#6
---
 lib/schema.js | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/lib/schema.js b/lib/schema.js
index 5ed761ad677..ca4dc3c2d6a 100644
--- a/lib/schema.js
+++ b/lib/schema.js
@@ -143,16 +143,20 @@ function aliasFields(schema) {
 
     if (alias) {
       if ('string' === typeof alias && alias.length > 0) {
-        if (schema.aliases[alias])
+        if (schema.aliases[alias]) {
           throw new Error('Duplicate alias, alias ' + alias + ' is used more than once');
-        else
+        } else {
           schema.aliases[alias] = prop;
+        }
 
         schema
           .virtual(alias)
           .get((function(p) {
             return function() {
-              return this.get(p);
+              if (typeof this.get === 'function') {
+                return this.get(p);
+              }
+              return this[p];
             };
           })(prop))
           .set((function(p) {