49 lines
1.4 KiB
Markdown
49 lines
1.4 KiB
Markdown
---
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id: 587d7fb7367417b2b2512c0d
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title: Use model.findById() to Search Your Database By _id
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challengeType: 2
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forumTopicId: 301544
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dashedName: use-model-findbyid-to-search-your-database-by-id
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---
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# --description--
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When saving a document, MongoDB automatically adds the field `_id`, and set it to a unique alphanumeric key. Searching by `_id` is an extremely frequent operation, so Mongoose provides a dedicated method for it.
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# --instructions--
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Modify the `findPersonById` to find the only person having a given `_id`, using `Model.findById() -> Person`. Use the function argument `personId` as the search key.
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# --hints--
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Find an item by Id should succeed
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/find-by-id').then(
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(data) => {
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assert.equal(data.name, 'test', 'item.name is not what expected');
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assert.equal(data.age, 0, 'item.age is not what expected');
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assert.deepEqual(
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data.favoriteFoods,
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['none'],
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'item.favoriteFoods is not what expected'
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);
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assert.equal(data.__v, 0, 'The item should be not previously edited');
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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# --solutions--
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```js
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/**
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Backend challenges don't need solutions,
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because they would need to be tested against a full working project.
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Please check our contributing guidelines to learn more.
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*/
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```
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