retrieve all whose `date` is within last 6 minutes - node.js

Question

I have a Product collection stored in MongoDB. It has a attribute date :
const productSchema = new mongoose.Schema<ProductAttrs>({
date: {
type: Date,
required: true,
}
...
})
I would like to retrieve all products whose date is within last 6 minutes comparing with current time. What is the efficient way to retrieve that in mongoose ?
I am using express.js + typescript + mongoose v5.11 in my project.

Answer 1

You must use Mongoose to search every record where the time is greater than now - 6 minutes.
I have no way to test it, but the query should look something like this:
const sixMinutes = (6*60*1000); // 6 minutes
let sixMinutesAgo = new Date();
sixMinutesAgo.setTime(sixMinutesAgo.getTime() - sixMinutes);
const products = Product.find({
date: {
$gte: sixMinutesAgo
}
})

Answer 2

If your MongoDB server version is 5.0 you could use the new operator $dateDiff. In this case it is very handy and you do not even need an aggregate:
db.collection.find({
"$expr": {
"$lte": [
{
"$dateDiff": {
startDate: "$date",
endDate: new Date(),
unit: "minute"
}
},
6
]
}
})
It allows you to specify the unit field, which makes the query very straightforward in my opinion.
$expr evaluates an expression and returns true or false, just that. If the expression result is true then the row is returned, otherwise it is not.
$lte means less than or equal (the <= operator) and it returns true only when the first argument is less than or equal the second operator. Basically, this is what it does in pseudocode:
foreach doc in collection
if (minute)(currentDate - document.date) <= 6 then
return document