How can I retrieve current week's data on Mongoose? - mongodb

Question

I have a Model for all requests that I get for my business (real estate).
I want to create an aggregation middleware based on the "createdAt" field which returns only models created between monday at midnight and the present time.
I have looked through all previous questions but could not find anything and the aggregation docs in mongo are so huge I cannot wrap my head around!
Do you have any tips?
I have tried this but it's returning an empty array:
getGestionaleStats = async (req, res) => {
try {
const richieste = await Richiesta.aggregate([
{
$match: {
createdAt: { $lt: new Date() }
}
},
{
$group: {
_id: { $week: '$createdAt' }
}
}
]);
res.status(200).json({
status: 'success',
data: { richieste }
});
} catch (err) {
console.error(err.message);
res.status(500).json({
status: 'error',
data: err.message
});
}
Of course the {$lt: new Date()} is probably where the problem lies.
Any suggestions?

Answer 1

This solution uses Aggregation query and a custom JavaScript function. The function takes a date object and returns the first Monday's date before today. This is used to get all the documents with createdAt date after the calculated date.
// Function returns the date of the "last Monday" from
// the given input date.
function getLastMonday(dt) {
let n = null; // last Monday conversion
switch (dt.getDay()) {
case 0: n = -5; break;
case 1: n = -6; break;
case 2: n = 0; break;
case 3: n = -1; break;
case 4: n = -2; break;
case 5: n = -3; break;
case 6: n = -4; break;
default: "This never happens";
}
let today_date = new Date(dt.getFullYear(), dt.getMonth(), dt.getDate());
let last_monday_date = today_date.setDate(today_date.getDate() + n );
return last_monday_date;
}
var d = ISODate(); // -or- any date like ISODate("2019-11-26T00:00:00Z")
var LAST_MONDAY = getLastMonday(d);
db.test.aggregate( [
{
$addFields: {
last_monday: {
$dateFromParts : {
year: { $year: new Date(LAST_MONDAY) },
month: { $month: new Date(LAST_MONDAY) },
day: { $dayOfMonth: new Date(LAST_MONDAY) }
}
},
created_at: {
$dateFromParts : {
year: { $year: "$createdAt" },
month: { $month: "$createdAt" },
day: { $dayOfMonth: "$createdAt" }
}
}
}
},
{
$match: { $expr: { $gt: [ "$created_at", "$last_monday" ] } }
},
{
$project: { created_at: 0, last_monday: 0 }
}
] )
For a set of input documents like this:
{ _id : 1, createdAt : ISODate("2019-12-03T00:00:00Z") }
{ _id : 2, createdAt : ISODate("2019-11-12T02:00:00Z") }
{ _id : 3, createdAt : ISODate("2019-11-25T05:00:00Z") }
{ _id : 4, createdAt : ISODate("2019-11-26T00:00:00Z") }
{ _id : 9, createdAt : ISODate("2019-12-02T23:45:00Z") }
And, LAST_MONDAY = getLastMonday(ISODate("2019-12-04T05:40:20Z")), the aggregation query returns the document with _id : 1.

Answer 2

I'm using momentJS for this:
const result = Collection.aggregate([
{
$match: {
createdAt: {
$gte: moment().startOf('isoweek').toDate(),
$lt: moment().endOf('isoweek').toDate()
},
}
}
]);

Answer 3

I've found an answer with vanillaJS:
const richieste = await Richiesta.aggregate([
{
$match: {
createdAt: { $gte: getBeginningOfTheWeek(new Date()), $lt: new Date() }
}
},
{
$group: {
_id: null,
count: { $sum: 1 }
}
},
]}
where getBeginningOfTheWeek is as such:
exports.getBeginningOfTheWeek = (now) => {
const days = (now.getDay() + 7 - 1) % 7;
now.setDate(now.getDate() - days);
now.setHours(0, 0, 0, 0);
return now;
};
The latter function is from T.J. Crowder: get current week moday javascript