[英]MongoDB: get sum by year/month with nested values
我正在尝试对嵌套金额的集合求和(按月/年支出) - 没有运气。
这是集合(摘录):
[
{
"_id" : ObjectId("5faaf88d0657287993e541a5"),
"segment" : {
"l1" : "Segment A",
"l2" : "001"
},
"invoiceNo" : "2020.10283940",
"invoicePos" : 3,
"date" : ISODate("2019-09-06T00:00:00.000Z"),
"amount" : {
"document" : {
"amount" : NumberDecimal("125.000000000000"),
"currCode" : "USD"
},
"local" : {
"amount" : NumberDecimal("123.800000000000"),
"currCode" : "CHF"
},
"global" : {
"amount" : NumberDecimal("123.800000000000"),
"currCode" : "CHF"
}
}
},
...
]
我想以“全球”货币总结每月的汇总发票量。
我在 MongoDB 上尝试了这个查询:
db.invoices.aggregate(
{$project : {
month : {$month : "$date"},
year : {$year : "$date"},
amount : 1
}},
{$unwind: '$amount'},
{$group : {
_id : {month : "$month" ,year : "$year" },
total : {$sum : "$amount.global.amount"}
}})
我得到的结果是:
/* 1 */
{
"_id" : ObjectId("5faaf88d0657287993e541a5"),
"amount" : {
"document" : {
"amount" : NumberDecimal("125.000000000000"),
"currCode" : "USD"
},
"local" : {
"amount" : NumberDecimal("123.800000000000"),
"currCode" : "CHF"
},
"global" : {
"amount" : NumberDecimal("123.800000000000"),
"currCode" : "CHF"
}
},
"month" : 9,
"year" : 2019
}
/* 2 */
{
"_id" : ObjectId("5faaf88d0657287993e541ac"),
"amount" : {
"document" : {
"amount" : NumberDecimal("105.560000000000"),
"currCode" : "CHF"
},
"local" : {
"amount" : NumberDecimal("105.560000000000"),
"currCode" : "CHF"
},
"global" : {
"amount" : NumberDecimal("105.560000000000"),
"currCode" : "CHF"
}
},
"month" : 11,
"year" : 2020
}
然而,这不会汇总每个月的所有发票,而是看起来像单个发票行 - 没有聚合。
我想得到这样的结果:
[
{
"month": 11,
"year": 2020,
"amount" : NumberDecimal("99999.99")
},
{
"month": 10,
"year": 2020,
"amount" : NumberDecimal("99999.99")
},
{
"month": 9,
"year": 2020,
"amount" : NumberDecimal("99999.99")
}
]
我的查询有什么问题?
这会有帮助吗?
db.invoices.aggregate([
{
$group: {
_id: {
month: {
$month: "$date"
},
year: {
$year: "$date"
}
},
total: {
$sum: "$amount.global.amount"
}
}
},
{$sort:{"_id.year":-1, "_id.month":-1}}
])
如果您需要任何额外的解释,请告诉我,但代码非常简短且不言自明。
原则上您的聚合管道很好,有一些错误:
$unwind
没用,因为$amount
不是数组。 一个元素输入 -> 一个文档输出所以,简短而简单:
db.invoices.aggregate([
{
$group: {
_id: { month: { $month: "$date" }, year: { $year: "$date" } },
total: { $sum: "$amount.global.amount" }
}
}
])
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