Question

我尝试使用Spring数据Mongo聚合库在mongo集合上创建投影。

假设我有这个集合：

{
    "_id": "33",
    "name": "Foo",
    "payments": {
        "years": [{
            "year": 2017,
            "quarters": [{
                "quarter": 3,
                "transactions": [{
                    "amount": 800,
                    "type": "VARIA"
                    "dayOfMonth": 10
                }]
            }]
        }]
}

我使用这个mongo聚合查询：

db.customers.aggregate(
 { $match: { "_id": {$in:
 ["33", "80"]
 } }},
 { $project: { "payments":{"years":{"quarters":{"transactions":{"amount":1,"type":1}}}} } },
 { $unwind: "$payments.years" },
 { $unwind: "$payments.years.quarters" },
 { $unwind: "$payments.years.quarters.transactions" },
 { $match: { "payments.years.quarters.transactions.amount": {$ne: "0.00" }} },
 { $group: { "_id": "$_id", "payments": {"$push": "$payments.years.quarters.transactions"} }}
 )

但我现在正尝试在我的java应用程序中实现它。我使用spring-data-mongo。

我尝试这样做，但后来我收到的结果为零。

MatchOperation matchAllKlantenStage = Aggregation.match(new Criteria("_id").in(ids));

ProjectionOperation projectStage = project()
        .and("payments.years.quarters.transactions")
        .nested(bind("type","payments.years.quarters.transactions.type")
        .and("amount", "payments.years.quarters.transactions.amount")
        .and("dayOfMonth", "payments.years.quarters.transactions.dayOfMonth"));


Aggregation aggregation = newAggregation(
        matchAllKlantenStage,
        projectStage,
        unwind("payments.years.quarters.transactions"),
        match(new Criteria("payments.years.quarters.transactions.amount").ne("0.00")),
        group().push("payments.years.quarters.transactions").as("payments")
);

任何人都可以帮我吗？

亲切的问候，

卡伊

具有弹簧聚合的嵌套投影

0 个答案: