Solution of Perform Classic Updates by Running Find, Edit, then Save

var findEditThenSave = function(personId, done) {
var foodToAdd = ‘hamburger’;
Person.findById({_id:personId},(err,personFound)=>{
if(err) console.error(err);
personFound.favoriteFoods.push(foodToAdd)
personFound.save(function(err,data){
if(err) console.error(err)
done(null,data)
})
})

};