Nested $addFields in MongoDB - mongodb

Question

I have the following document:
[
{
"callId": "17dac51e-125e-499e-9064-f20bd3b1a9d8",
"caller": {
"firstName": "Test",
"lastName": "Testing",
"phoneNumber": "1231231234"
},
"inquiries": [
{
"inquiryId": "b0d14381-ce75-49aa-a66a-c36ae20b72a8",
"routeHistory": [
{
"assignedUserId": "cfa0ffe9-c77d-4eec-87d7-4430f7772e81",
"routeDate": "2020-01-01T06:00:00.000Z",
"status": "routed"
},
{
"assignedUserId": "cfa0ffe9-c77d-4eec-87d7-4430f7772e81",
"routeDate": "2020-01-03T06:00:00.000Z",
"status": "routed"
}
]
},
{
"inquiryId": "9d743be9-7613-46d7-8f9b-a04b4b899b56",
"routeHistory": [
{
"assignedUserId": "cfa0ffe9-c77d-4eec-87d7-4430f7772e81",
"routeDate": "2020-01-01T06:00:00.000Z",
"status": "ended"
},
{
"assignedUserId": "cfa0ffe9-c77d-4eec-87d7-4430f7772e81",
"routeDate": "2020-01-03T06:00:00.000Z",
"status": "ended"
}
]
}
]
}
]
And I'm using the following aggregate:
{
$unwind: '$inquiries',
},
{
$addFields: {
'inquiries.routeHistory': {
$filter: {
input: '$inquiries.routeHistory',
cond: {
$eq: [{ $max: '$inquiries.routeHistory.routeDate' }, '$$this.routeDate'],
},
},
},
},
},
{
$group: {
_id: '$_id',
callId: { $first: '$callId' },
caller: { $first: '$caller' },
inquiries: { $push: '$inquiries' },
},
}
I would like to expand this query to be able to further filter at the inquiry grain, so that I am returning only the inquiry that contains my specified criteria. E.g. if I wanted to find where inquiry.routeHistory.status = ended, I would expect the following results:
[
{
"callId": "17dac51e-125e-499e-9064-f20bd3b1a9d8",
"caller": {
"firstName": "Test",
"lastName": "Testing",
"phoneNumber": "1231231234"
},
"inquiries": [
{
"inquiryId": "9d743be9-7613-46d7-8f9b-a04b4b899b56",
"routeHistory": [
{
"assignedUserId": "cfa0ffe9-c77d-4eec-87d7-4430f7772e81",
"routeDate": "2020-01-03T06:00:00.000Z",
"status": "ended"
}
]
}
]
}
]
Is there a way to do nested $addField or is there another route I could take?

Answer 1

Since you're using $unwind you can do that easily by adding $match since expression: "inquiries.routeHistory.status": "ended" will return true if there's any document in routeHistory having such status:
db.collection.aggregate([
{
$unwind: "$inquiries"
},
{
$match: {
"inquiries.routeHistory.status": "ended"
}
},
{
$addFields: {
"inquiries.routeHistory": {
$filter: {
input: "$inquiries.routeHistory",
cond: {
$eq: [ { $max: "$inquiries.routeHistory.routeDate" }, "$$this.routeDate" ]
}
}
}
}
},
{
$group: {
_id: "$_id",
callId: { $first: "$callId" },
caller: { $first: "$caller" },
inquiries: { $push: "$inquiries" }
}
}
])
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