From 03f7e5d5bae2a610e5fa9350626c6022092c0ac9 Mon Sep 17 00:00:00 2001
From: Valeri Karpov <val@karpov.io>
Date: Fri, 12 Feb 2021 13:22:22 -0500
Subject: [PATCH] test(document): repro #9889

---
 test/document.test.js | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/test/document.test.js b/test/document.test.js
index 104f50220a..4bc194033e 100644
--- a/test/document.test.js
+++ b/test/document.test.js
@@ -5873,6 +5873,30 @@ describe('document', function() {
       assert.equal(called, 1);
     });
 
+    it('doesnt call setters when init-ing an array (gh-9889)', function() {
+      let called = 0;
+      const testSchema = new mongoose.Schema({
+        arr: [{
+          type: 'ObjectId',
+          set: v => {
+            ++called;
+            return v;
+          }
+        }]
+      });
+
+      const Test = db.model('Test', testSchema);
+
+      return co(function*() {
+        let doc = yield Test.create({ arr: [new mongoose.Types.ObjectId()] });
+        assert.equal(called, 1);
+
+        called = 0;
+        doc = yield Test.findById(doc);
+        assert.equal(called, 0);
+      });
+    });
+
     it('nested virtuals + nested toJSON (gh-6294)', function() {
       const schema = mongoose.Schema({
         nested: {