在Mongodb和GOlang中删除另一个对象内的对象

package main

import (
    "context"
    "fmt"
    "log"

    "go.mongodb.org/mongo-driver/bson"
    "go.mongodb.org/mongo-driver/mongo"
    "go.mongodb.org/mongo-driver/mongo/options"
)

type User struct {
    ID       string   `bson:"_id"`
    Name     string   `bson:"name"`
    Email    string   `bson:"email"`
    Contacts []string `bson:"contacts"`
}

func main() {
    // 连接到MongoDB数据库
    client, err := mongo.Connect(context.TODO(), options.Client().ApplyURI("mongodb://localhost:27017"))
    if err != nil {
        log.Fatal(err)
    }

    // 选择数据库和集合
    collection := client.Database("mydb").Collection("users")

    // 查询包含该对象的文档
    filter := bson.M{"name": "John"}
    var user User
    err = collection.FindOne(context.TODO(), filter).Decode(&user)
    if err != nil {
        log.Fatal(err)
    }

    // 删除另一个对象内的对象
    delete(user.Contacts, "Alice")

    // 更新文档
    update := bson.M{"$set": bson.M{"contacts": user.Contacts}}
    _, err = collection.UpdateOne(context.TODO(), filter, update)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Println("Successfully deleted object from another object in MongoDB")
}