upsert in mongoose code example

Example 1: mongoose find and update prop

var query = {'username': req.user.username};
req.newData.username = req.user.username;

MyModel.findOneAndUpdate(query, req.newData, {upsert: true}, function(err, doc) {
    if (err) return res.send(500, {error: err});
    return res.send('Succesfully saved.');
});

Example 2: mongoose findoneandupdate

// note: this uses async/await so it assumes the whole thing 
// is in an async function 

const doc = await CharacterModel.findOneAndUpdate(
  { name: 'Jon Snow' },
  { title: 'King in the North' },
  // If `new` isn't true, `findOneAndUpdate()` will return the
  // document as it was _before_ it was updated.
  { new: true }
);

doc.title; // "King in the North"

Example 3: findone and update mongoose

// Using queries with promise chaining
Model.findOne({ name: 'Mr. Anderson' }).
  then(doc => Model.updateOne({ _id: doc._id }, { name: 'Neo' })).
  then(() => Model.findOne({ name: 'Neo' })).
  then(doc => console.log(doc.name)); // 'Neo'

// Using queries with async/await
const doc = await Model.findOne({ name: 'Neo' });
console.log(doc.name); // 'Neo'