Multiple groups and project using mongoose - node.js

Question

I'm trying display aggregated data by a time range in Mongoose. My Data is like:
{company: "1" createdTime:"2017-01-01"}
{company: "1" createdTime:"2017-01-01"}
{company: "1" createdTime:"2017-01-02"}
{company: "2" createdTime:"2017-01-02"}
{company: "2" createdTime:"2017-01-03"}
{company: "3" createdTime:"2017-01-03"}
{company: "3" createdTime:"2017-01-03"}
I have created a query like:
{
"aggregate": [{
"$project": {
"frequency": {
"$dateToString": {
"format": "%Y-%m-%d",
"date": "$createdTime"
}
}
}
}, {
"$group": {
"_id": {
"date": "$frequency"
},
"count": {
"$sum": 1
}
}
}
]
}
and returns:
[
{
"_id": {
"date": "2017-01-01"
},
"count": 2
},
{
"_id": {
"date": "2017-01-02"
},
"count": 2
},
{
"_id": {
"date": "2017-01-03"
},
"count": 3
}
]
Which gives me the count for the overall occurrences for that particular date, which is fine.
I'm wanting to further break that down to give me the sum of occurrences per company for that date which should look something like this:
[
{
"_id": {
"date": "2017-01-01",
"companies": [{
"company": 1,
"count": 2
}]
},
"count": 2
},
{
"_id": {
"date": "2017-01-02",
"companies": [{
"company": 1,
"count": 1
},{
"company": 2,
"count": 1
}]
},
"count": 2
},
{
"_id": {
"date": "2017-01-03",
,
"companies": [{
"company": 2,
"count": 1
},{
"company": 3,
"count": 2
}]]
},
"count": 3
}
]
I've tried all sort of combinations but always get errors when i put in a second group and i can't work out how to do it?
EDIT
I wasn't able to use examples from the comments or they didn't work for my use case however, combining this information i came up with this:
{
"aggregate": [{
"$group": {
"_id": {
"company": "$company",
"date": {
"$dayOfMonth": "$createdTime"
},
"month": {
"$month": "$createdTime"
},
"year": {
"$year": "$createdTime"
}
},
"count": {
"$sum": 1
}
}
}, {
"$group": {
"_id": "$_id.company",
"events": {
"$push": {
"date": "$_id.date",
"month": "$_id.month",
"year": "$_id.year",
"count": "$count"
}
},
"totalEvents": {
"$sum": "$count"
}
}
}
]
}
which renders some results like:
[
{
"_id": "1",
"dateCount": [
{
"date": 3,
"month": 12,
"year": 2017,
"count": 40
},
{
"date": 10,
"month": 12,
"year": 2017,
"count": 8
}
]
}
]
Ideally the date would be yyyy-mm-dd but using the full date in the query would include the time also resulting in an entry for each time not date. I guess this will do for now, i can easily create a date from this albeit it's a little more cumbersome but it'll do until anything better comes along.
Edit 2
[{
"_id": ObjectId("5a38a03b33ccd28fb87f6dc9"),
"createdBy": ObjectId("5a2e203fa567425b2cb411fc"),
"appId": ObjectId("5a2e203fa567425b2cb411fb"),
"eventName": "event",
"userName": "person",
"userEmail": "company__29",
"organisation": "company",
"module": "module",
"createdTime": ISODate("2017-12-02T17:07:25.000Z")
"__v": 0
}
]
Query:
{
"aggregate": [{
"$project": {
"frequency": {
"$dateToString": {
"format": "%U",
"date": "$createdTime"
}
}
}
}, {
"$group": {
"_id": {
"frequency": "$frequency",
"organisation": "$organisation"
},
"count": {
"$sum": 1
}
}
}, {
"$group": {
"_id": {
"date": "$_id.frequency"
},
"count": {
"$sum": 1
},
"companies": {
"$push": {
"organisation": "$organisation",
"count": "$count"
}
}
}
}
]
}