mongoose modify results code example
Example 1: 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 2: findbyid mongoose
// Find the adventure with the given `id`, or `null` if not found
await Adventure.findById(id).exec();
// using callback
Adventure.findById(id, function (err, adventure) {});
// select only the adventures name and length
await Adventure.findById(id, 'name length').exec();