---
id: 587d7fb8367417b2b2512c0f
title: Perform New Updates on a Document Using model.findOneAndUpdate()
challengeType: 2
forumTopicId: 301542
dashedName: perform-new-updates-on-a-document-using-model-findoneandupdate
---

# --description--

Recent versions of Mongoose have methods to simplify documents updating. Some more advanced features (i.e. pre/post hooks, validation) behave differently with this approach, so the classic method is still useful in many situations. `findByIdAndUpdate()` can be used when searching by id.

# --instructions--

Modify the `findAndUpdate` function to find a person by `Name` and set the person's age to `20`. Use the function parameter `personName` as the search key.

**Note:** You should return the updated document. To do that, you need to pass the options document `{ new: true }` as the 3rd argument to `findOneAndUpdate()`. By default, these methods return the unmodified object.

# --hints--

findOneAndUpdate an item should succeed

```js
  const response = await fetch(code + '/_api/find-one-update', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      name: 'Dorian Gray',
      age: 35,
      favoriteFoods: ['unknown']
    })
  });
  if (!response.ok) {
    throw new Error(await response.text());
  }
  const data = await response.json();
  assert.equal(data.name, 'Dorian Gray', 'item.name is not what expected');
  assert.equal(data.age, 20, 'item.age is not what expected');
  assert.deepEqual(
    data.favoriteFoods,
    ['unknown'],
    'item.favoriteFoods is not what expected'
  );
  assert.equal(
    data.__v,
    0,
    'findOneAndUpdate does not increment version by design!'
  );
```

