Golang MongoDB UUID

mongouuid.go

package mongouuid

import (
	"fmt"

	"github.com/google/uuid"
	"go.mongodb.org/mongo-driver/bson/bsontype"
	"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
)

type UUID struct {
	data uuid.UUID
}

func (u *UUID) String() string {
	return u.data.String()
}

func (u UUID) MarshalBSONValue() (bsontype.Type, []byte, error) {
	return bsontype.Binary, bsoncore.AppendBinary(nil, bsontype.BinaryUUID, u.data[:]), nil
}

func (u *UUID) UnmarshalBSONValue(t bsontype.Type, raw []byte) error {
	if t != bsontype.Binary {
		return fmt.Errorf("expected Binary type, got %+v", t)
	}

	subtype, data, _, ok := bsoncore.ReadBinary(raw)
	if !ok {
		return fmt.Errorf("not enough bytes to unmarshal bson value")
	}
	if subtype != bsontype.BinaryUUID {
		return fmt.Errorf("expected UUID subtype, got %+v", t)
	}

	var err error
	u.data, err = uuid.FromBytes(data)
	return err
}

func FromString(str string) (v UUID, err error) {
	v.data, err = uuid.Parse(str)
	return
}

func FromBytes(b []byte) (v UUID, err error) {
	v.data, err = uuid.FromBytes(b)
	return
}

Thanks to the right subtype (i.e. 0x04, see bsontype.BinaryUUID), now it shows correctly from the command line as well: