How to group by in MongoDB Compass based on the time? - sql

Question

Recently I'm working with a Mongodb database. Here is the data model of the document I need to run a query on:
{
"creation_date": {
"$date": {
"$numberLong": "1641981205813"
}
},
"user_id": {
"$oid": "61dedd8b7a520461dd78016b"
},
"products": [
{
"_id": {
"$oid": "61dede397a520461dd7818bd"
},
"product_id": {
"$oid": "615071ae8b66e1e9a3d6ea50"
},
"payment": true,
"support_all_payment": false,
"term_ids": null
}
],
"carts_info": [
{
"_id": {
"$oid": "61dede397a520461dd7818be"
},
"support_type": null,
"support_price": 0,
"product_price": 11000,
"product_type": "all",
"final_price": 11000,
"product_id": {
"$oid": "615071ae8b66e1e9a3d6ea50"
}
}
],
"_des": "initial_payment",
"_type": "online",
"_token": "9e0cb4d111f642f1a6f482bb04f1f57b",
"_price": 11000,
"_status": "unpaid",
"_terminal_id": "12605682",
"__v": 0,
"additional_information": {
"saman_bank": {
"MID": "0",
"ResNum": "61dede387a520461dd7818bb",
"State": "CanceledByUser",
"TraceNo": "",
"Wage": "",
"Rrn": "",
"SecurePan": "",
"HashedCardNumber": "",
"Status": "1"
}
}
}
This collection is user orders. I need to count the orders for today. So, I need such a equivalent query for Mongodb Compass the same as this SQL:
SELECT count(1) num,
date(creation_date) date
FROM orders
WHERE date(creation_date) = "2023-02-16"
GROUP BY date
Any idea how can I run this logic on Mongodb Compass?

Answer 1

Use $dateTrunc to perform date only operations.
db.collection.aggregate([
{
"$match": {
$expr: {
$eq: [
{
$dateTrunc: {
date: "$creation_date",
unit: "day"
}
},
ISODate("2022-01-12")
]
}
}
},
{
$group: {
_id: {
$dateTrunc: {
date: "$creation_date",
unit: "day"
}
},
num: {
$sum: 1
}
}
}
])
Mongo Playground
For OP's MongoDB v3.6, we can use $dateToString to perform string comparison on a date-only string.
db.collection.aggregate([
{
$addFields: {
dateOnly: {
"$dateToString": {
"date": "$creation_date",
"format": "%Y-%m-%d"
}
}
}
},
{
$match: {
dateOnly: "2022-01-12"
}
},
{
$group: {
_id: null,
num: {
$sum: 1
}
}
}
])
Mongo Playground