Q:

.updateOne on MongoDB not working in Node.js

I have the following code: 
connection((db) => {
            db.collection('orders')
                .updateOne(
                    { "_id": req.body._id}, // Filter
                    {"name": req.body.name} // Update
                )
                .then((obj) => {
                    console.log('Updated - ' + obj);
                    res.redirect('orders')
                })
                .catch((err) => {
                    console.log('Error: ' + err);
                })
        })

I want to change the name in the order but it doesn't update it.
The result in the console is 
Updated - {"n":0,"nModified":0,"ok":1}
I tried to read the documentation but it's horrific
EDIT: {$set: {"name": req.body.name}}, didn't work as well
EDIT 2: The passed ID matches the _id in the database. Could it be a problem that I'm querying for plain text ID while in the database it is referred to as "ObjectId('5a42ja...')"

A:

Maybe you should use "$set" in your update query like this :
{$set: {"name": req.body.name}}, // Update

More information in documentation
EDIT
If it doesn't work, this is probably because there is no match with your filter.
Maybe you should try to match with an ObjectId like this :
var ObjectID = require('mongodb').ObjectID;

// In your request
{ "_id": ObjectID(req.body._id)}, // Filter

Hope it helps.

A:

Use {$set: {"name": req.body.name}} (as Sparw mentioned) to update the the properties you want in the document. Also, if the id that you pass as a parameter does not exists in the collection (and you want to create one with the same id) you can pass as a third parameter {upsert: true} to create one.
In your example:
connection((db) => {
          db.collection('orders')
               .updateOne(
                  { "_id": req.body._id}, // Filter
                  {$set: {"name": req.body.name}}, // Update
                  {upsert: true} // add document with req.body._id if not exists 

             )
            .then((obj) => {
               console.log('Updated - ' + obj);
              res.redirect('orders')
         })
        .catch((err) => {
           console.log('Error: ' + err);
      }) })

