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

Are you not just asking to pass in all the fields that you posted? Why not do this then?

(And basically just a cut and paste of your code):

collection.update(
    {_id: ObjectId(req.session.userID)},
    {$set: req.body }
)

Then whatever content you posted as fields is set within your update.

Note that use of set will only overwrite, or add new fields. If you just want to replace the whole document, then remove the whole {$set: (..) } notation and just pass in req body as it's a valild object.