46 lines
1.5 KiB
Markdown
46 lines
1.5 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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---
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## Description
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<section id='description'>
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When saving a document, mongodb automatically adds the field <code>_id</code>, and set it to a unique alphanumeric key. Searching by <code>_id</code> is an extremely frequent operation, so mongoose provides a dedicated method for it.
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</section>
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## Instructions
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<section id='instructions'>
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Find the (only!!) person having a given <code>_id</code>, using <code>Model.findById() -> Person</code>. Use the function argument <code>personId</code> as the search key.
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: Find an item by Id should succeed
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testString: "getUserInput => $.get(getUserInput('url') + '/_api/find-by-id').then(data => { assert.equal(data.name, 'test', 'item.name is not what expected'); assert.equal(data.age, 0, 'item.age is not what expected'); assert.deepEqual(data.favoriteFoods, ['none'], 'item.favoriteFoods is not what expected'); assert.equal(data.__v, 0, 'The item should be not previously edited'); }, xhr => { throw new Error(xhr.responseText); })"
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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</section>
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## Solution
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<section id='solution'>
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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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</section>
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