how to use mongoose aggregate to search an array within a collection - node.js

Question

I am trying to group by products in my sales collection and add their totals to know which are the best selling products of my app.
MONGOOSE MODEL
const mongoose = require('mongoose');
const DHCustomerinvoiceSchema = mongoose.Schema({
Saledetail: {
type: Array,
required: true
},
date:{
type: Date,
required: true
},
total:{
type: Number,
required: true
},
pay:{
type: Number,
required: true,
default: 0
},
topay:{
type: Number,
required: true
},
user:{
type: mongoose.Schema.Types.ObjectId,
required: true,
ref: 'UserDH'
},
customer:{
type: mongoose.Schema.Types.ObjectId,
required: true,
ref: 'DHcontacto'
},
state:{
type: String,
default: "OWED"
},
created:{
type: Date,
default: Date.now()
},
});
module.exports = mongoose.model('DHCustomerinvoice', DHCustomerinvoiceSchema);
COLLECTION EXAMPLE
{
"id": "5ef6*****",
"Saledetail": [
{
"id": "5ebf*****",
"quantity": 9,
"price": 2000,
"totalline": 18000
}
],
"datesale": "1593129600000",
"grandtotal": 18000,
"user": "5eb9ab******",
"customer": {
"name": "isabella"
},
"state": "PAID"
},
RESOLVER:
mostSellingProducts: async (_,{},ctx)=>{
const Products = await invoice.aggregate([
{ $unwind: "$Saledetail" },
{ $match: { "state" : 'PAID'}},
{ $group: {
_id : "$Saledetail.id",
total: { $sum: '$Saledetail.totalline' }
}},
{
$lookup: {
from: 'dhproducts',
localField: '_id',
foreignField: "_id",
as: "producto"
}
},
{
$limit: 4
},
{
$sort : {total: -1}
}
]);
console.log(Products);
return Products;
},
I have used many methods that actually did not give me this result, but nevertheless I have achieved a positive result in terms of finding my best clients who actually develop it with aggregate, match and group also apply sort and limit ...
but with this example I have not been able to achieve success, and I imagine that it is because the architecture of the collection is distinguished due to the arrangement of the purchase detail

Answer 1

I don't have enough reputation to comment on your question. So I am sharing this as an answer.
I think you can use $elemMatch to search for the item in an array.
const Productos = await Factura.aggregate([{ detlle: { $elemMatch: { $gte: 80, $lt: 85 } } }])
For more detailed info elemMatch

Answer 2

below the answer to my question
mostSellingProducts: async (_,{},ctx)=>{
const Products = await Invoice.aggregate([
{ $unwind: "$Saledetail" },
{ $match: { "state" : 'PAY'}},
{ $group: {
_id : { $toObjectId: "$Saledetail.id" },
total: { $sum: '$Saledetail.totalline' }
}},
{
$lookup: {
from: 'dhproducts',
localField: '_id',
foreignField: "_id",
as: "products"
}
},
{
$limit: 4
},
{
$sort : {total: -1}
}
]);
return Products;
},