Files
freeCodeCamp/curriculum/challenges/chinese/05-apis-and-microservices/mongodb-and-mongoose/delete-many-documents-with-model.remove.md

56 lines
1.5 KiB
Markdown
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

---
id: 587d7fb8367417b2b2512c11
title: 使用 model.remove() 删除多个 document
challengeType: 2
forumTopicId: 301538
---
# --description--
`Model.remove()` 可以用于删除符合给定匹配条件的所有 document。
# --instructions--
如果想要删除所有叫 "Mary" 的人,我们可以使用 `Model.remove()`,并给它传入一个包含 `name` 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。
**注意:** `Model.remove()` 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 `done()` 回调,因为我们需要在挑战的测试中调用它。
# --hints--
Deleting many items at once should succeed
```js
```
应成功地删除多条数据
```js
(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);
}
);
```
# --solutions--