Aggregate.sort(object: Object): Aggregate支持端:小程序 2.7.4, 云函数 0.8.1, Web 聚合阶段。根据指定的字段,对输入的文档进行排序。 参数object: Object返回值AggregateAPI 说明形式如下: sort({
<字段名1>: <排序规则>,
<字段名2>: <排序规则>,
})
<排序规则>可以是以下取值: - 1 代表升序排列(从小到大);
- -1 代表降序排列(从大到小);
示例升序/降序排列假设我们有集合 articles,其中包含数据如下: { "_id": "1", "author": "stark", "score": 80, "age": 18 }
{ "_id": "2", "author": "bob", "score": 60, "age": 18 }
{ "_id": "3", "author": "li", "score": 55, "age": 19 }
{ "_id": "4", "author": "jimmy", "score": 60, "age": 22 }
{ "_id": "5", "author": "justan", "score": 95, "age": 33 }
db.collection('articles')
.aggregate()
.sort({
age: -1,
score: -1
})
.end()
上面的代码在 students 集合中进行聚合搜索,并且将结果排序,首先根据 age 字段降序排列,然后再根据 score 字段进行降序排列。 输出结果如下: { "_id": "5", "author": "justan", "score": 95, "age": 33 }
{ "_id": "4", "author": "jimmy", "score": 60, "age": 22 }
{ "_id": "3", "author": "li", "score": 55, "age": 19 }
{ "_id": "1", "author": "stark", "score": 80, "age": 18 }
{ "_id": "2", "author": "bob", "score": 60, "age": 18 }
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