如何在mongo DB $match中创建Golang dynamic bson

import (
    "context"
    "fmt"
    "log"

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

func main() {
    // 创建MongoDB客户端
    clientOptions := options.Client().ApplyURI("mongodb://localhost:27017")
    client, err := mongo.Connect(context.TODO(), clientOptions)
    if err != nil {
        log.Fatal(err)
    }

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

    // 创建动态BSON查询条件
    query := bson.M{
        "$match": bson.M{
            "field1": "value1",
            "field2": bson.M{"$gt": 10},
        },
    }

    // 执行查询
    cursor, err := collection.Aggregate(context.TODO(), mongo.Pipeline{query})
    if err != nil {
        log.Fatal(err)
    }

    // 处理查询结果
    for cursor.Next(context.TODO()) {
        var result bson.M
        err := cursor.Decode(&result)
        if err != nil {
            log.Fatal(err)
        }
        fmt.Println(result)
    }

    // 关闭连接
    err = client.Disconnect(context.TODO())
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println("Connection to MongoDB closed.")
}