I was getting MongoDB data. If I use the JavaScript parameter while retrieving data from MongoDB it returns null, if I type it manually it returns all the data without issue. That's working
const data = await NumbersModel.aggregate([{
$project: {
Datas: {
$filter: {
input: "$Datas",
as: "data",
cond: {
$gte: ["$$data.time", 0]
}
}
}
}
}])
res.send(data)
That's not working
if (req.query.lasttimestamp === null) return res.send(`cannot be empty`)
let lasttimestamp = req.query.lasttimestamp
const data = await NumbersModel.aggregate([
{
$project: {
Datas: {
$filter: {
input: "$Datas",
as: "data",
cond: { $gte: [ "$$data.time", lasttimestamp ] }
}
}
}
}
])
res.send(data)
The values in req.query are strings. You want to convert it to a number:
let lasttimestamp = parseInt(req.query.lasttimestamp);