Why doesn't mongoose update the document?

Question

JavaScript

User.findOne({ userId: userid }, function (err, user) {
            if (err) return console.log('ERROR');

            user.lvl += 1;
            user.save((err, doc) => {
                if (err) return console.log('save error!');

                console.log('Saved user: ', doc);
            });
        });

Why doesn't this code update the document? There are no errors, a supposedly saved copy is returned. In fact, nothing has been updated.

Answer 1

For example, this lvl is not in the scheme.

Answer 2

const updatedUser = await User.findOneAndUpdate(
  { userId: userid }, 
  { $inc: { lvl: 1 } },
  { new: true }
)