MongoDB and Mongoose: Add missing hint

Tell us what’s happening:

MongoDB and Mongoose - Perform Classic Updates by Running Find, Edit, then Save without a hint.

Your code so far

var findEditThenSave = function (personId, done) {
  var foodToAdd = 'hamburger';
  Person.findById(personId, function (err, person) {
    if (err) console.error(err);
    person.favoriteFoods.push(foodToAdd);
    person.save(function (saveErr, data) {
      if (saveErr) console.error(saveErr);
      done(null, data);
    });
    
  })
};

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36 Edg/83.0.478.58.

Challenge: Perform Classic Updates by Running Find, Edit, then Save

Link to the challenge: