Mongodb aggregation and nested grouping - mongodb

Question

I have the following MongoDB data model:
{
"_id": {
"$oid": "5ffd62eedf2075dfc5a5b0b8"
},
"portfolio": "4086_ClearCreek",
"ruleDescription": "Maximum Moody's Rating Factor Test",
"failureLevel": 3,
"failureCategory": "",
"hasHoldings": true,
"summaryStatus": 0,
"summaryStatusLabel": "Failure",
"ruleType": 1,
"ruleSource": 0,
"ruleValueType": 0,
"testValue": "3673",
"limitValue": "2400",
"limitOperator": "<=",
"testRoom": "-1273",
"numeratorValue": "185278281.19",
"denominatorValue": "680407923070.46",
"ruleCategory": "Collateral Quality",
"topLevelFilter": {
"id": "5fd1bd7868d7ac4e211a7642",
"type": "WSO CMP Dataset",
"name": "Clear Creek CLO, LTD._Clear Creek Test Data Set_Initial"
},
"executionDateTime": "2021-01-12T08:50:54.103"
}
I want to see results like this:-
{
"_id" : "Concentration Limitations",
"pass" : 1,
"warn" : 0,
"fail" : 0,
"portfolio" : [
{
"id" : "5fd1bd7868d7ac4e211a7642",
"name" : "Clear Creek CLO, LTD._Clear Creek Test Data Set_Initial",
"pass" : 1,
"warn" : 0,
"fail" : 0
}
]
}
This is my code that i am trying to achive the above result set:
db.rule_execution_result.aggregate([{
$group: {
_id: '$ruleCategory',
pass: {
$sum: {
$cond: [{
$eq: ["$summaryStatus", 1]
}, 1, 0]
}
},
warn: {
$sum: {
$cond: [{
$eq: ["$summaryStatus", 2]
}, 1, 0]
}
},
fail: {
$sum: {
$cond: [{
$eq: ['$summaryStatus', 0]
}, 1, 0]
}
},
portfolio: {
$push: {
id: '$$ROOT.topLevelFilter.id',
name: '$$ROOT.topLevelFilter.name',
category: '$$ROOT.ruleCategory',
summary:'$$ROOT.summaryStatus',
pass: '',
warn: '',
fail: ''
}
}
}
}
]).pretty()
I want to make one another nested group for portfolio on the basis of topLevelFilter.id and calculate sum of summaryStatus, but unable to do so.
So Can anyone please help me to achive the result set?.

Answer 1

first $group by both ruleCategory and topLevelFilter.id, get required count and fields
second $group by ruleCategory and sum counts and make array of portfolio
db.collection.aggregate([
{
$group: {
_id: {
ruleCategory: "$ruleCategory",
topLevelFilter: "$topLevelFilter.id"
},
name: { $first: "$topLevelFilter.name" },
summaryStatus: { $first: "$summaryStatus" },
pass: { $sum: { $cond: [{ $eq: ["$summaryStatus", 1] }, 1, 0] } },
warn: { $sum: { $cond: [{ $eq: ["$summaryStatus", 2] }, 1, 0] } },
fail: { $sum: { $cond: [{ $eq: ["$summaryStatus", 0]}, 1, 0] } }
}
},
{
$group: {
_id: "$_id.ruleCategory",
pass: { $sum: "$pass" },
warn: { $sum: "$warn" },
fail: { $sum: "$fail" },
portfolio: {
$push: {
id: "$_id.topLevelFilter",
name: "$name",
summary: "$summaryStatus",
pass: "$pass",
warn: "$warn",
fail: "$fail"
}
}
}
}
])
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