47 lines
1.6 KiB
Markdown
47 lines
1.6 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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localeTitle: 使用 model.findById() 方法，根据 _id 来搜索数据
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---
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## Description
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<section id='description'>
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在保存 document 的时候，MongoDB 会自动为它添加 <code>_id</code> 字段，并给该字段设置一个唯一的仅包含数字和字母的值。通过 <code>_id</code> 搜索是一个十分常见的操作，为此，Mongoose 提供了一个专门的方法。
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</section>
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## Instructions
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<section id='instructions'>
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执行<code>Model.findById() -> Person</code>，使用 <code>personId</code> 作为搜索参数，根据 <code>_id</code> 找到对应的（唯一的）person。
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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: 应成功地根据 Id 找到对应的数据
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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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