如何将这个mongodb查询构建到java代码中

Question

{
    $group : {...some query operation}, 
    $project : {
        _id:"$_id",
        day_work : { // <-- I can't express this code in Java
            timestamp:"$timestamp",
            view : "$view",
            pay : "$pay"
        }
    }
}

当像这样的样本数据

{
    ... //some field and value,
    timestamp:1411214521,
    view : 3,
    pay : 105
}

如果上面的查询确实有效，我希望是这样的

{
    ... //some field and value,
    day_work : {
            "timestmp":1411214521,
            view : 3,
            pay : 105
    }
}

我试着这样做

Aggregation.project("_id").andInclude("timestamp"，“查看”，“支付”) // <--无法合并到day_work中

谢谢你的帮忙

Answer 1

我找到了答案

Aggregation.project() .and(“day_work”).nested(“时间戳”，“时间戳”).and(“视图”，“视图”)...etc