Possible bug for findOneAndUpdate set field how generic object

[cesxhin]

A created this schema

Schema({ test: Object }, {minimize: false});

and when I findOneAndUpdate the fields are always reset rather than added.

await model.findOneAndUpdate({}, {$set: {test: { cat: "mew!" }}}, {new: true}) //show -> cat

await model.findOneAndUpdate({}, {$set: {test: { dog: "bau!" }}}, {new: true}) //show only -> dog (the cat should also show)

[vkarpov15]

You would do $set: { 'test.dog': 'bau!' } to add a dog field to test without overwriting the existing test property. When you do $set: { test: { dog: 'bau' } }, the MongoDB server interprets that as "replace the entire test property with the object { dog: 'bau' }