---
id: 587d7fb8367417b2b2512c0f
title: Perform New Updates on a Document Using model.findOneAndUpdate()
challengeType: 2
forumTopicId: 301542
---

## Description

<section id='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.

</section>

## Instructions

<section 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.

</section>

## Tests

<section id='tests'>

```yml
tests:
  - text: findOneAndUpdate an item should succeed
    testString: |
      getUserInput => $.post(getUserInput('url') + '/_api/find-one-update', {name:'Dorian Gray', age: 35, favoriteFoods:['unknown']}).then(data => {
        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!');
        }, xhr => { throw new Error(xhr.responseText); })
```

</section>

## Challenge Seed

<section id='challengeSeed'>

</section>

## Solution

<section id='solution'>

```js
/**
  Backend challenges don't need solutions, 
  because they would need to be tested against a full working project. 
  Please check our contributing guidelines to learn more.
*/
```

</section>