Go 将地图转换为bson

bson文件应为：

type Player struct {
    id bson.ObjectId
    test map[int]int
}

func (this *Player) Id() bson.ObjectId {
    return this.id
}

func (this *Player) DbObj() bson.D {

    testBson := bson.D{}
    for k,v := range this.test {
        testBson = append(testBson, bson.M{"id":k, "v":v}) // compile error
    }
    return bson.D{
        {"_id",this.id},
        {"test", testBson},
    }
}

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但是我不知道如何将map对象转换为[{'id'：1，'v'：1}，…，{'id'：2，'v'：2}]，bson.M不是D包含的DocElem类型

使用Go切片表示bson数组：

{'_id':ObjectId(xx),'test':[{'id':1,'v':1},..., {'id':2,'v':2}]}

func (this *Player) DbObj() bson.D {
    var testBson []bson.M
    for k,v := range this.test {
        testBson = append(testBson, bson.M{"id":k, "v":v}) 
    }
    return bson.D{
        {"_id",this.id},
        {"test", testBson},
    }
}