Question

我使用Node.JS和Express创建了一个服务器。数据库是MongoDB。这就是我要做的。

根据版本字段和到期日期（即3月3日）的当前月份，应相对于“ curr”字段添加“ value”字段中的所有int值。

这是我收藏中的对象数据。

{ 
"_id" : ObjectId("5c98d1276e20472820b2e924"), 
"curr" : "INR", 
"version" : "K3",
 "value" : 30, 
 "expiry" : "2019-03-25T13:01:26.732Z" 
},
{ 
"_id" : ObjectId("5c98d12b6e20472820b2e925"), 
"curr" : "INR", 
"version" : "K4", 
"value" : 10, 
"expiry" : "2019-03-25T13:01:30.489Z" 
},
{ 
"_id" : ObjectId("5c98d12c6e20472820b2e926"), 
"curr" : "USD", 
"version" : "K3", 
"value" : 15, 
    "expiry" : "2019-02-21T13:01:31.500Z" 
},
{ 
"_id" : ObjectId("5c98d12d6e20472820b2e927"), 
"curr" : "EUR", 
"version" : "K3", 
"value" : 3, 
"expiry" : "2019-01-17T13:01:32.517Z" 
},
{ 
"_id" : ObjectId("5c98d1fac021c738a4d14130"), 
"curr" : "INR", 
"version" : "K3", 
"value" : 10, 
"expiry" : "2019-03-25T13:01:30.489Z"
}

这是我在nodejs中尝试过的

dbo.collection(collectionName).aggregate(
    [
        { 
            $match : { version : version, month: { $month: "$expiry" }}
        },
        {
            $group : {
            _id : {
                currency : "$curr",
                version:"$version",
                totalValue:{$sum : "$value"}
            },
        }
    }
    ]
).toArray(function(errr,docss){
    if(!errr){
        if(docss.length>0){
            res.end(JSON.stringify(docss));
        }
        else{
            console.log(`No data found for ${version}.`);
            res.end(JSON.stringify([]));
        }
    }
    else{
        console.log(errr);
    }
});

结果必须是这样

[{"_id":{"currency":"INR","version":"K3","month":3,"totalValue":40}},{"_id":{"currency":"EUR","version":"K3","month":1,"totalValue":3}},{"_id":{"currency":"USD","version":"K3","month":2,"totalValue":15}}]

我要去哪里错了？请帮助我。

查询以添加基于聚合MongoDB的字段

0 个答案: