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$not
$not聚合运算符对表达式执行逻辑 NOT 运算。true如果表达式的计算结果为false，如果表达式的计算结果为，false则返回。true
参数
示例（MongoDB 外壳）
以下示例演示如何使用$not运算符反转布尔值。
创建示例文档
db.users.insertMany([
{ _id: 1, name: "Alice", active: true },
{ _id: 2, name: "Bob", active: false },
{ _id: 3, name: "Charlie", active: true }
]);
查询示例
db.users.aggregate([
{
$project: {
name: 1,
active: 1,
inactive: { $not: ["$active"] }
}
}
]);
输出
[
{ _id: 1, name: 'Alice', active: true, inactive: false },
{ _id: 2, name: 'Bob', active: false, inactive: true },
{ _id: 3, name: 'Charlie', active: true, inactive: false }
]
代码示例
要查看使用$not聚合运算符的代码示例，请选择要使用的语言的选项卡：
- Node.js
-
const { MongoClient } = require('mongodb');
async function example() {
const client = await MongoClient.connect('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false');
const db = client.db('test');
const collection = db.collection('users');
const result = await collection.aggregate([
{
$project: {
name: 1,
active: 1,
inactive: { $not: ["$active"] }
}
}
]).toArray();
console.log(result);
await client.close();
}
example();
- Python
-
from pymongo import MongoClient
def example():
client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
db = client['test']
collection = db['users']
result = list(collection.aggregate([
{
'$project': {
'name': 1,
'active': 1,
'inactive': { '$not': ['$active'] }
}
}
]))
print(result)
client.close()
example()
