freeCodeCamp/curriculum/challenges/english/05-apis-and-microservices/mongodb-and-mongoose/perform-new-updates-on-a-document-using-model.findoneandupdate.md

---
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
(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);
    }
  );
```

# --solutions--

```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.
*/
```