Get Highest Value By Hour in MongoDB for given Date Range? - mongodb

Question

I have the following document structure in MongoDB :
{
"_id" : ObjectId("5c1b7451b1829b69963029ea"),
"duration" : 92,
"accountId" : ObjectId("9aafe7b01cf4560c9bb5d68"),
"createdAt" : ISODate("2018-12-20T10:52:01.560Z"),
"__v" : 0,
},
{
"_id" : ObjectId("5c1b7451b1829b69963029ea"),
"duration" : 192,
"accountId" : ObjectId("9aafe7b01cf4560c9bb5d68"),
"createdAt" : ISODate("2018-12-20T11:52:01.560Z"),
"__v" : 0,
}
Now I want to get the highest sum of duration for the day with corresponding hour. Technically, something like this :
{
"readableDate" : "2018-12-20",
"hour" : 11,
"total" : 192
}
Where total is the hourly total which is HIGHEST for that particular day.
The query which I have tried is as follows :
db.getCollection('operational_details').aggregate(
{"$match": {"accountId": ObjectId("9aafe7b01cf4560c9bb5d68"),
"createdAt": {"$gte": ISODate("2019-06-01T10:30:29.725Z"),
"$lte": ISODate("2019-06-04T10:30:29.725Z")},
}},
{ "$project": {
"date": {"$dateToString": {"format": "%Y-%m-%d", "date": "$createdAt"}},
"hour": {"$hour":"$createdAt"},
"total":{"$sum": "$duration"} }
},
{ "$group":{
"_id": { "hour":"$hour","date":"$date"},
"max": {"$max": "$total"}
}})
Hope I am clear with my example. TIA

Answer 1

Please try the below
working playground link
//Array
[
{
"_id": ObjectId("5cf4f20243f560e1e0a77014"),
"duration": 92,
"accountId": ObjectId("6ef4f20243f560e1e0a77015"),
"createdAt": ISODate("2018-12-20T10:52:10.320Z")
},
{
"_id": ObjectId("5cf4f21843f560e1e0a7701a"),
"duration": 192,
"accountId": ObjectId("6ef4f20243f560e1e0a77015"),
"createdAt": ISODate("2018-12-20T11:52:11.123Z")
}
]
//Script
db.collection.aggregate([
{
"$match": {
"accountId": {
$eq: ObjectId("6ef4f20243f560e1e0a77015")
},
"createdAt": {
$gte: ISODate("2018-12-19T10:30:00.000Z"),
$lte: ISODate("2018-12-21T10:30:00.000Z")
}
}
},
{
"$project": {
"date": {
"$dateToString": {
"format": "%Y-%m-%d",
"date": "$createdAt"
}
},
"hour": {
"$hour": "$createdAt"
},
"duration": "$duration"
}
},
{
"$group": {
"_id": {
"hour": "$hour",
"date": "$date"
},
"total": {
"$sum": "$duration"
}
}
},
{
"$project": {
"readableDate": "$_id.date",
"hour": "$_id.hour",
"total": "$total"
}
},
{
"$project": {
"_id": 0
}
},
{
"$sort": {
"total": -1
}
},
{
"$limit": 1
}
])
//Result
[
{
"hour": 11,
"readableDate": "2018-12-20",
"total": 192
}
]