I'm facing some issue and I have no idea what keyword should I search for in the MongoDB docs.
So the problem is, I have a list of transactions record made by users right now, eg as below.
[
{
"_id": Some_Mongo_ID,
"invoiceId": "ABCDEFG",
"username": "randomUser"
"amount": 80,
"createdAt": "2022-04-18T06:59:07.836Z"
},
{
"_id": Some_Mongo_ID,
"invoiceId": "ABCDEFG",
"username": "randomUser"
"amount": 70,
"createdAt": "2022-04-19T06:59:07.836Z"
},
{
"_id": Some_Mongo_ID,
"invoiceId": "ABCDEFG",
"username": "randomUser"
"amount": 55,
"createdAt": "2022-05-18T06:59:07.836Z"
},
...
]
In a Dashboard app that I'm working with right now, there's a line chart. To feed the line chart I will need to somehow make query/aggregation on the raw data of Transactions that I have, and group them into an array of objects, containing the months and total spend during that month.
[
{
"period": "2022-04",
"totalSpending": 900
},
{
"period": "2022-05",
"totalSpending": 2000
},
{
"period": "2022-06",
"totalSpending": 367
},
...
]
Is it technically possible to query/aggregate data that I have and make them group by months into an array as showed above?
Would be appreciated if any info is provided. Thanks
db.collection.aggregate([
{
"$group": {
"_id": {
month: { //Group by Month
"$month": "$createdAt"
},
year: { //Group by Year
"$year": "$createdAt"
}
},
"totalSpending": { //Accumulate sum for the group
$sum: "$amount"
}
}
},
{
"$project": { //You can ignore this if the group format is ok
"totalSpending": 1,
"period": { //To form the expected string
"$concat": [
{
$toString: "$_id.year"
},
"-",
{
$toString: "$_id.month"
}
]
},
"_id": 0
}
}
])