49 lines
1.4 KiB
Markdown
49 lines
1.4 KiB
Markdown
---
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id: 587d7fb7367417b2b2512c0d
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title: 使用 model.findById() 方法，根据 _id 来搜索数据
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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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在保存 document 的时候，MongoDB 会自动为它添加 `_id` 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 `_id` 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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# --instructions--
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修改 `findPersonById`，用 `Model.findById() -> Person` 来查询唯一一个给定 `_id` 的人， 把函数参数 `personId` 作为查询键。
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# --hints--
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应成功地根据 Id 找到对应的数据
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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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