49 lines
1.8 KiB
Markdown
49 lines
1.8 KiB
Markdown
---
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id: 587d7fb8367417b2b2512c11
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challengeType: 2
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forumTopicId: 301538
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title: 使用 model.remove() 删除多个 document
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---
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## Description
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<section id='description'>
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<code>Model.remove()</code> 可以用于删除符合给定匹配条件的所有 document。
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</section>
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## Instructions
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<section id='instructions'>
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如果想要删除所有叫 "Mary" 的人，我们可以使用 <code>Model.remove()</code>，并给它传入一个包含 <code>name</code> 字段的对象作为查询条件。当然，我们还需要给它传入一个回调函数。
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<strong>注意：</strong><code>Model.remove()</code> 不会返回被删除的 document，而是会返回一个包含操作结果以及受影响的数据数量的 JSON 对象。不要忘记将它传入 <code>done()</code> 回调，因为我们需要在挑战的测试中调用它。
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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: Deleting many items at once should succeed
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- text: 应成功地删除多条数据
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testString: 'getUserInput => $.ajax({url: getUserInput(''url'') + ''/_api/remove-many-people'', type: ''POST'', contentType:''application/json'', data: JSON.stringify([{name: ''Mary'', age: 16, favoriteFoods: [''lollipop'']}, {name: ''Mary'', age: 21, favoriteFoods: [''steak'']}])}).then(data => { assert.isTrue(!!data.ok, ''The mongo stats are not what expected''); assert.equal(data.n, 2, ''The number of items affected is not what expected''); assert.equal(data.count, 0, ''the db items count is not what expected''); }, 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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