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WriteValueBytes can only write while positioned on a Element or Value but is positioned on a TopLevel尝试为 bson.M 创建自定义 mashler/unmashler 时出现错误

我有一个名为 TransactionId 的自定义类型，它代表一个 UUID，我想在存储到 monbodb 之前将此值转换为字符串，并在从 mongodb 提取值时将其从字符串转换回来。

这是我到目前为止的代码

package main

import (
    "github.com/google/uuid"
    "github.com/pkg/errors"
    "go.mongodb.org/mongo-driver/bson/bsontype"
    "go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
    "go.mongodb.org/mongo-driver/bson"
    "log"
)

// TransactionID is a UUID used to trace a batch of work which is being processed.
type TransactionID uuid.UUID

// String returns the transaction id as a string
func (id TransactionID) String() (result string, err error) {
    val, …