Mongo DB Group and Count based on 2 fields(direct field and nested field) - group-by

Question

I am new to Mongo DB query. Here I have a collection of documents in the below structure. As a top level, need to group based on label and below that based on role and their corresponding status grouping. Since it is nested I have tried with $objectToArray
[
{
"_id": "637f58f205b3fcaa10767ab6",
"status": {
"MAN": "inprogress",
"DEV": "new",
"TEST": "new"
},
"label": "ABC1"
},
{
"_id": "637f58f205b3fcaa10767ab7",
"status": {
"MAN": "inprogress",
"DEV": "completed",
"TEST": "inprogress"
},
"label": "ABC2"
},
{
"_id": "637f58f205b3fcaa10767ab8",
"status": {
"MAN": "completed",
"DEV": "new",
"TEST": "completed"
},
"label": "ABC3"
},
{
"_id": "637f58f205b3fcaa10767ab9",
"status": {
"MAN": "new",
"DEV": "completed",
"TEST": "inprogress"
},
"label": "ABC1"
},
{
"_id": "637f58f205b3fcaa10767ac1",
"status": {
"MAN": "new",
"DEV": "completed",
"TEST": "inprogress"
},
"label": "ABC2"
}
]
I am using the following aggregate:
db.getCollection("requirements").aggregate([
{ "$addFields": {
"status": {
"$map": {
"input": { "$objectToArray": "$status" },
"as": "el",
"in": {
"$concat": ["$$el.k", "_", "$$el.v"]
}
}
}
} },
{ "$unwind": "$status" },
{
$group: {
_id: {label: "$label",roleGroup: "$status"},
totalCount: { $sum: 1}
}
},
{
$group:{
_id:"$_id.label",
roleGroups:{$push:{roleGroup:"$_id.roleGroup", totalCount:"$totalCount"}}
}
}
])
And am able to get the following output:
{
"_id" : null,
"counts" : [
{
"k" : "ABC3",
"v" : [
{
"roleGroup" : "DEV_completed",
"totalCount" : 1.0
},
{
"roleGroup" : "MAN_inprogress",
"totalCount" : 1.0
},
{
"roleGroup" : "MAN_completed",
"totalCount" : 1.0
},
{
"roleGroup" : "MAN_new",
"totalCount" : 1.0
},
{
"roleGroup" : "DEV_inprogress",
"totalCount" : 1.0
},
{
"roleGroup" : "DEV_new",
"totalCount" : 1.0
},
{
"roleGroup" : "TEST_new",
"totalCount" : 2.0
},
{
"roleGroup" : "TEST_inprogress",
"totalCount" : 1.0
}
]
},
{
"k" : "ABC2",
"v" : [
{
"roleGroup" : "DEV_inprogress",
"totalCount" : 1.0
},
{
"roleGroup" : "MAN_completed",
"totalCount" : 1.0
},
{
"roleGroup" : "MAN_new",
"totalCount" : 1.0
},
{
"roleGroup" : "TEST_new",
"totalCount" : 2.0
},
{
"roleGroup" : "DEV_new",
"totalCount" : 1.0
}
]
},
{
"k" : "ABC4",
"v" : [
{
"roleGroup" : "TEST_new",
"totalCount" : 1.0
},
{
"roleGroup" : "DEV_new",
"totalCount" : 1.0
},
{
"roleGroup" : "MAN_new",
"totalCount" : 1.0
}
]
},
{
"k" : "ABC1",
"v" : [
{
"roleGroup" : "TEST_new",
"totalCount" : 3.0
},
{
"roleGroup" : "MAN_new",
"totalCount" : 3.0
},
{
"roleGroup" : "DEV_new",
"totalCount" : 3.0
}
]
}
]
}
But I want the output like below:
[
{
"_id": "ABC1",
"MAN": {
"new": 1,
"inprogress": 2,
"completed": 1
},
"DEV": {
"new": 1,
"inprogress": 2,
"completed": 1
},
"TEST": {
"new": 1,
"inprogress": 2,
"completed": 1
},
"totalCount": 4
},
{
"_id": "ABC2",
"MAN": {
"new": 1,
"inprogress": 2,
"completed": 1
},
"DEV": {
"new": 1,
"inprogress": 2,
"completed": 1
},
"TEST": {
"new": 1,
"inprogress": 2,
"completed": 1
},
"totalCount": 4
}
]
I really need some of your inputs to get this format. Thanks in advance