Mongoose/MongoDB: Get second to last document - node.js

Question

How would I be able to get the 2nd to latest or previous day's document collection using Mongoose?
my code to get the latest data goes as follows:
data.findOne()
.sort({"_id": -1})
.exec(function(err, data) {
if (err) {
console.log('Error getting data..');
}
if (data) {
res.json(data);
}
else {
console.log('No data found!');
}
});
This only returns the LATEST document in the collection. I instead need the one prior to the latest one, so one from a day before this one, how would I be able to do this?

Answer 1

Then you'd have to use aggregation:
db.getCollection('data').aggregate([
{ $sort: {"date": -1}}, // sort by latest date (descending)
{ $limit: 2}, // limit to the first two results
{ $sort: {"date": 1}}, // sort these two ascending
{ $limit: 1} // get first document
])
This pipeline is translated in mongoose like that (I think):
data.aggregate([
{ $sort: {"date": -1}},
{ $limit: 2},
{ $sort: {"date": 1}},
{ $limit: 1}
], function (err, result) {
if (err) {
next(err);
} else {
res.json(result);
}
});
Also by sorting without adding a $match pipeline, your first $sort would sort all the documents in your collection. So if your collection is big you might want to restrict them with some query parameters that you can add to the $match pipeline. You could add the match before the first $sort
E.g.
db.getCollection('data').aggregate([
{ $match: {...}},
{ $sort: {"date": -1}},
{ $limit: 2},
{ $sort: {"date": 1}},
{ $limit: 1}
])

Answer 2

To get the 2nd before the last
data.find().sort({ _id: -1 }).limit(1).skip(2).exec(function(err, data) {
if (err) {
console.log('Error getting data..');
}
if (data) {
res.json(data);
}
else {
console.log('No data found!');
}
});

Answer 3

you could do like this:
data
.find()
.limit(2)
.sort({ "_id": -1 })
.exec(function(err, data) {
if (err) return res.json(err);
return res.json(data);
});
this will find on all documents sorted by id: -1, and then limit the result to two, this should give you the result that you want.

Answer 4

This is the fix I used to make it work for what I wanted, hope it helps others:
I decided to import MomentJS, from there it displays the current date, subtracting 1 from it, to display the previous date's value, hence giving me the proper collection from the day before.
Code:
const moment = require('moment');
...
data.find({"updated": moment().subtract(1, 'days').format('L')}) ...