我很幸运能够从@chridam获得另一个SO问题Mongo / Mongoose - Aggregating by Date的精彩答案，该问题给出了一组文档：
{ "_id" : ObjectId("5907a5850b459d4fdcdf49ac"), "amount" : -33.3, "name" : "RINGGO", "method" : "VIS", "date" : ISODate("2017-04-26T23:00:00Z"), "importDate" : ISODate("2017-05-01T21:15:49.581Z"), "category" : "Not Set", "__v" : 0 }
{ "_id" : ObjectId("5907a5850b459d4fdcdf49ba"), "amount" : -61.3, "name" : "Amazon", "method" : "VIS", "date" : ISODate("2017-03-23T00:00:00Z"), "importDate" : ISODate("2017-05-01T21:15:49.592Z"), "category" : "Not Set", "__v" : 0 }
{ "_id" : ObjectId("5907a5850b459d4fdcdf49ce"), "amount" : -3.3, "name" : "Tesco", "method" : "VIS", "date" : ISODate("2017-03-15T00:00:00Z"), "importDate" : ISODate("2017-05-01T21:15:49.601Z"), "category" : "Not Set", "__v" : 0 }
{ "_id" : ObjectId("5907a5850b459d4fdcdf49cc"), "amount" : -26.3, "name" : "RINGGO", "method" : "VIS", "date" : ISODate("2017-03-16T00:00:00Z"), "importDate" : ISODate("2017-05-01T21:15:49.600Z"), "category" : "Not Set", "__v" : 0 }
{ "_id" : ObjectId("5907a5850b459d4fdcdf49f7"), "amount" : -63.3, "name" : "Sky", "method" : "VIS", "date" : ISODate("2017-03-02T00:00:00Z"), "importDate" : ISODate("2017-05-01T21:15:49.617Z"), "category" : "Not Set", "__v" : 0 }
{ "_id" : ObjectId("5907a5850b459d4fdcdf49be"), "amount" : -3.3, "name" : "RINGGO", "method" : "VIS", "date" : ISODate("2017-03-22T00:00:00Z"), "importDate" : ISODate("2017-05-01T21:15:49.593Z"), "category" : "Not Set", "__v" : 0 }
需要一个按供应商，年，月和周汇总支出的查询。查询在下面，它几乎可以很好地工作但是因为我在我的应用程序中使用它我注意到一个重大问题
db.statements.aggregate([
{ "$match": { "name": "RINGGO" } },
{
"$redact": {
"$cond": [
{
"$and": [
{ "$eq": [{ "$year": "$date" }, 2017 ]}, // within my route this uses parseInt(req.params.year)
{ "$eq": [{ "$month": "$date" }, 3 ]}, // within my route this uses parseInt(req.params.month)
{ "$eq": [{ "$week": "$date" }, 12 ]} // within my route this uses parseInt(req.params.week)
]
},
"$$KEEP",
"$$PRUNE"
]
}
},{
"$group": {
"_id": {
"name": "$name",
"year": { "$year": "$date" },
"month": { "$month": "$date" },
"week": { "$week": "$date" }
},
"total": { "$sum": "$amount" }
}
},
{
"$group": {
"_id": {
"name": "$_id.name",
"year": "$_id.year"
},
"YearlySpends": { "$push": "$total" },
"totalYearlyAmount": { "$sum": "$total" },
"data": { "$push": "$$ROOT" }
}
},
{ "$unwind": "$data" },
{
"$group": {
"_id": {
"name": "$_id.name",
"month": "$data._id.month"
},
"YearlySpends": { "$first": "$YearlySpends" },
"totalYearlyAmount": { "$first": "$totalYearlyAmount" },
"MonthlySpends": { "$push": "$data.total" },
"totalMonthlyAmount": { "$sum": "$data.total" },
"data": { "$push": "$data" }
}
},
{ "$unwind": "$data" },
{
"$group": {
"_id": {
"name": "$_id.name",
"week": "$data._id.week"
},
"YearlySpends": { "$first": "$YearlySpends" },
"totalYearlyAmount": { "$first": "$totalYearlyAmount" },
"MonthlySpends": { "$first": "$MonthlySpends" },
"totalMonthlyAmount": { "$first": "$totalMonthlyAmount" },
"WeeklySpends": { "$push": "$data.total" },
"totalWeeklyAmount": { "$sum": "$data.total" },
"data": { "$push": "$data" }
}
},
{ "$unwind": "$data" },
{
"$group": {
"_id": "$data._id",
"YearlySpends": { "$first": "$YearlySpends" },
"totalYearlyAmount": { "$first": "$totalYearlyAmount" },
"MonthlySpends": { "$first": "$MonthlySpends" },
"totalMonthlyAmount": { "$first": "$totalMonthlyAmount" },
"WeeklySpends": { "$first": "$WeeklySpends" },
"totalWeeklyAmount": { "$first": "$totalWeeklyAmount" }
}
}
])
运行此查询将返回
{ "_id" :
{ "name" : "RINGGO",
"year" : 2017,
"month" : 3,
"week" : 12 },
"YearlySpends" : [ -9.6 ],
"totalYearlyAmount" : -9.6,
"MonthlySpends" : [ -9.6 ],
"totalMonthlyAmount" : -9.6,
"WeeklySpends" : [ -9.6 ],
"totalWeeklyAmount" : -9.6
}
当我改变想要查看月份的消费时
"$cond": [
{
"$and": [
{ "$eq": [{ "$year": "$date" }, 2017 ]},
{ "$eq": [{ "$month": "$date" }, 3 ]}
]
},
"$$KEEP",
"$$PRUNE"
]
我明白了：
{ "_id" : { "name" : "RINGGO", "year" : 2017, "month" : 3, "week" : 12 }, "YearlySpends" : [ -3.3, -9.6, -9.6, -3.3 ], "totalYearlyAmount" : -25.799999999999997, "MonthlySpends" : [ -3.3, -9.6, -9.6, -3.3 ], "totalMonthlyAmount" : -25.799999999999997, "WeeklySpends" : [ -9.6 ], "totalWeeklyAmount" : -9.6 }
{ "_id" : { "name" : "RINGGO", "year" : 2017, "month" : 3, "week" : 9 }, "YearlySpends" : [ -3.3, -9.6, -9.6, -3.3 ], "totalYearlyAmount" : -25.799999999999997, "MonthlySpends" : [ -3.3, -9.6, -9.6, -3.3 ], "totalMonthlyAmount" : -25.799999999999997, "WeeklySpends" : [ -3.3 ], "totalWeeklyAmount" : -3.3 }
{ "_id" : { "name" : "RINGGO", "year" : 2017, "month" : 3, "week" : 11 }, "YearlySpends" : [ -3.3, -9.6, -9.6, -3.3 ], "totalYearlyAmount" : -25.799999999999997, "MonthlySpends" : [ -3.3, -9.6, -9.6, -3.3 ], "totalMonthlyAmount" : -25.799999999999997, "WeeklySpends" : [ -9.6 ], "totalWeeklyAmount" : -9.6 }
{ "_id" : { "name" : "RINGGO", "year" : 2017, "month" : 3, "week" : 13 }, "YearlySpends" : [ -3.3, -9.6, -9.6, -3.3 ], "totalYearlyAmount" : -25.799999999999997, "MonthlySpends" : [ -3.3, -9.6, -9.6, -3.3 ], "totalMonthlyAmount" : -25.799999999999997, "WeeklySpends" : [ -3.3 ], "totalWeeklyAmount" : -3.3 }
然而，当我运行一个简单的db.statements.find({"name":"RINGGO"})时，我得到了：
{ "_id" : ObjectId("5907a5850b459d4fdcdf49ac"), "amount" : -3.3, "name" : "RINGGO", "method" : "VIS", "date" : ISODate("2017-03-26T23:00:00Z"), "importDate" : ISODate("2017-05-01T21:15:49.581Z"), "category" : "Not Set", "__v" : 0 }
{ "_id" : ObjectId("5907a5850b459d4fdcdf49ba"), "amount" : -6.3, "name" : "RINGGO", "method" : "VIS", "date" : ISODate("2017-03-23T00:00:00Z"), "importDate" : ISODate("2017-05-01T21:15:49.592Z"), "category" : "Not Set", "__v" : 0 }
{ "_id" : ObjectId("5907a5850b459d4fdcdf49ce"), "amount" : -3.3, "name" : "RINGGO", "method" : "VIS", "date" : ISODate("2017-03-15T00:00:00Z"), "importDate" : ISODate("2017-05-01T21:15:49.601Z"), "category" : "Not Set", "__v" : 0 }
{ "_id" : ObjectId("5907a5850b459d4fdcdf49cc"), "amount" : -6.3, "name" : "RINGGO", "method" : "VIS", "date" : ISODate("2017-03-16T00:00:00Z"), "importDate" : ISODate("2017-05-01T21:15:49.600Z"), "category" : "Not Set", "__v" : 0 }
{ "_id" : ObjectId("5907a5850b459d4fdcdf49f7"), "amount" : -3.3, "name" : "RINGGO", "method" : "VIS", "date" : ISODate("2017-03-02T00:00:00Z"), "importDate" : ISODate("2017-05-01T21:15:49.617Z"), "category" : "Not Set", "__v" : 0 }
{ "_id" : ObjectId("5907a5850b459d4fdcdf49be"), "amount" : -3.3, "name" : "RINGGO", "method" : "VIS", "date" : ISODate("2017-03-22T00:00:00Z"), "importDate" : ISODate("2017-05-01T21:15:49.593Z"), "category" : "Not Set", "__v" : 0 }
因此，您可以看到先前输出中的MonthlySpends中的项目数与“按名称查找”的输出中显示的项目数相同。另外，您可以看到，MonthlySpends中的某些值在它们不应该的时候汇总在一起。
理想情况下，我希望获得以下输出：
当我$redact包含：
"$cond": [
{
"$and": [
{ "$eq": [{ "$year": "$date" }, 2017 ]},
{ "$eq": [{ "$month": "$date" }, 3 ]},
{ "$eq": [{ "$week": "$date" }, 12 ]}
]
},
"$$KEEP",
"$$PRUNE"
]
返回
{ "_id" : { "name" : "RINGGO", "year" : 2017, "month" : 3, "week" : 12 }, "YearlySpends" : [ -3.3, -9.6, -9.6, -3.3 ], "totalYearlyAmount" : -25.799999999999997, "MonthlySpends" : [ -3.3, -9.6, -9.6, -3.3 ], "totalMonthlyAmount" : -25.799999999999997, "WeeklySpends" : [ -9.6 ], "totalWeeklyAmount" : -9.6 }
当我$redact包含：
"$cond": [
{
"$and": [
{ "$eq": [{ "$year": "$date" }, 2017 ]},
{ "$eq": [{ "$month": "$date" }, 3 ]},
]
},
"$$KEEP",
"$$PRUNE"
]
返回
{ "_id" : { "name" : "RINGGO", "year" : 2017, "month" : 3 }, "YearlySpends" : [ -3.3, -9.6, -9.6, -3.3 ], "totalYearlyAmount" : -25.799999999999997, "MonthlySpends" : [ -3.3, -9.6, -9.6, -3.3 ], "totalMonthlyAmount" : -25.799999999999997 }
当我$redact包含：
"$cond": [
{
"$and": [
{ "$eq": [{ "$year": "$date" }, 2017 ]}
]
},
"$$KEEP",
"$$PRUNE"
]
返回
{ "_id" : { "name" : "RINGGO", "year" : 2017 }, "YearlySpends" : [ -3.3, -9.6, -9.6, -3.3 ], "totalYearlyAmount" : -25.799999999999997}
在这方面需要任何帮助。我已经尝试过修改查询，但我担心我不能理解它，无法正确修改它。
我的Mongoose版本为^4.9.5，我的mongo为3.4.2。
答案 0 :(得分：0)
您可以$facet与$addFields一起尝试3.4版本中的并行聚合。
这将降低整体复杂性，您可以同时使用自己的匹配输入运行分组。
以下代码根据请求对象动态构建聚合管道。
// Sample request
var request = {
"name":"RINGGO",
"year": 2017,
"month":3,
"week":12
};
// Build initial match document on name
var match1 = {
name: request["name"]
};
// Build project & facet document for date based aggregation
var addFields = {};
var facet = {};
// Add year followed by year facet
if (request["year"]) {
addFields["year"] = { "$year": "$date" },
facet["Yearly"] =
[
{
"$match":{ "year": request["year"] }
},
{
"$group": {
"_id": {
"name": "$name",
"year": "$year"
},
"spend": { "$push":"$amount" },
"total": { "$sum": "$amount" }
}
}
];
}
// Add month followed by month facet
if (request["month"]) {
addFields["month"] = { "$month": "$date" };
facet["Monthly"] =
[
{
"$match":{ "month": request["month"] }
},
{
"$group": {
"_id": {
"name": "$name",
"month": "$month"
},
"spend": { "$push":"$amount" },
"total": { "$sum": "$amount" }
}
}
];
}
// Add week followed by week facet
if (request["week"]) {
addFields["week"] = { "$week": "$date" };
facet["Weekly"] =
[
{
"$match":{ "week": request["week"] }
},
{
"$group": {
"_id": {
"name": "$name",
"week": "$week"
},
"spend": { "$push":"$amount" },
"total": { "$sum": "$amount" }
}
}
];
}
// Use aggregate builder
statements.aggregate()
.match(match1)
.append({"$addFields": addFields}) // No addFields stage in mongoose builder
.facet(facet)
.exec(function(err, data) {});
Mongo Shell查询name/year/month/week条件。
db.statements.aggregate({
'$match': {
name: 'RINGGO'
}
}, {
'$addFields': {
year: {
'$year': '$date'
},
month: {
'$month': '$date'
},
week: {
'$week': '$date'
}
}
}, {
'$facet': {
Yearly: [{
'$match': {
year: 2017
}
},
{
'$group': {
_id: {
name: '$name',
year: '$year'
},
spend: {
'$push': '$amount'
},
total: {
'$sum': '$amount'
}
}
}
],
Monthly: [{
'$match': {
month: 3
}
},
{
'$group': {
_id: {
name: '$name',
month: '$month'
},
spend: {
'$push': '$amount'
},
total: {
'$sum': '$amount'
}
}
}
],
Weekly: [{
'$match': {
week: 12
}
},
{
'$group': {
_id: {
name: '$name',
week: '$week'
},
spend: {
'$push': '$amount'
},
total: {
'$sum': '$amount'
}
}
}
]
}
})
样本回复
{
"Yearly": [{
"_id": {
"name": "RINGGO",
"year": 2017
},
"spend": [-3.3, -6.3, -3.3, -6.3, -3.3, -3.3],
"total": -25.799999999999997
}],
"Monthly": [{
"_id": {
"name": "RINGGO",
"month": 3
},
"spend": [-3.3, -6.3, -3.3, -6.3, -3.3, -3.3],
"total": -25.799999999999997
}],
"Weekly": [{
"_id": {
"name": "RINGGO",
"week": 12
},
"spend": [-6.3, -3.3],
"total": -9.6
}]
}
您可以为Year/Month和Year输入值运行类似的聚合。
所以你可以看到有不同数量的物品 以前输出中的MonthlySpends与输出中显示的相比 从名字找到。你也可以看到一些值 当它们不应该在MonthlySpends中汇总时。
这种情况发生在$group 1，其中$week汇总将两个日期[15,16]中的每一个汇总到第11周，其他两个日期[22,23]汇总到第12周以后显示在MonthySpends中总计为总计。