MongoDB, update collection field if new value is not null

Question

I would update a collection setting the value only if the new values are not null. I have a code like this:

 ...
 var userName = req.body.nome;
 var userSurn         


        

Answer 1

This version still allows for null string fields to be respected and updated. Omitted fields would be ignored.

const cleanedObject = Object.keys(origObject).reduce((acc, k) => {
  if (typeof origObject[k] === "undefined") return acc;
  acc[k] = origObject[k];
  return acc;
}, {});

collection.update({_id:ObjectId(req.session.userID)}, cleanedObject })