Single array of objects sort and slice not working - mongodb

Question

I have a single entry on a collection like this:
{
"_id" : ObjectId("60c6f7a5ef86bd1a5402e928"),
"cid" : 1,
"array1" : [
{ "type": "car", value: 20 },
{ "type": "bike", value: 50 },
{ "type": "bus", value: 5 },
{ "type": "cycle", value: 100 },
...... 9000 more entry something like this
],
"array2" : [
{ "type": "laptop", value: 200 },
{ "type": "desktop", value: 15 },
{ "type": "tablet", value: 55 },
{ "type": "mobile", value: 90 },
...... 9000 more entry something like this
]
}
Now I want to sort and slice the data for the pagination purpose.
For that I wrote the query which works well on slice case but not on sort case.
This is my query which works for slice case
let val = await SomeCollectionName.findOne(
{ cid: 1 },
{ _id: 1 , array1: { $slice: [0, 10] } } ---> its return the 10 data. Initially it return from 0 to 10, then next call $slice: [10, 10]
).exec();
if (val) {
//console.log('Got the value')
}
console.log(error)
This is my query When I add sort with slice
let val = await SomeCollectionName.findOne(
{ cid: 1 },
{ _id: 1 , array1: { $sort: { value: -1 }, $slice: [0, 10] } }
).exec();
if (val) {
//console.log('Got the value')
}
console.log(error)
Is there anyone who guide me where I'm wrong or suggest me what is the efficient way for getting the data.
UPDATE
I am getting the answer from the above question and looking for the same implementation for two array.
Everything is same. Earlier I was dealing with 1 array now this time I have to deal with two array.
Just curious to know that how these things happen
I wrote the aggregation query but one array results is fine but others are returning the same data throughout the array.
This is my query as per the suggestion of dealing with single array with sort and slice
db.collection.aggregate([
{
"$match": {
"cid": 1
}
},
{
$unwind: "$array1"
},
{
$unwind: "$array2"
},
{
"$sort": {
"array1.value": -1,
"array2.value": -1,
}
},
{
$skip: 0
},
{
$limit: 3
},
{
$group:{
"_id":"$_id",
"array1":{$push:"$array1"},
"array2":{$push:"$array2"}
}
}
])

Answer 1

The issue is that $sort is not supported by findOne() in its projection parameter.
You can instead use aggregation to achieve the expected result,
db.collection.aggregate([
{
"$match": {
"cid": 1
}
},
{
$unwind: "$array1"
},
{
"$sort": {
"array1.value": -1
}
},
{
$skip: 0
},
{
$limit: 3
},
{
$group: {
"_id": "$_id",
"array1": {
$push: {
"type": "$array1.type",
"value": "$array1.value"
}
},
"array2": {
"$first": "$array2"
}
},
},
{
$unwind: "$array2"
},
{
"$sort": {
"array2.value": -1
}
},
{
$skip: 0
},
{
$limit: 3
},
{
$group: {
"_id": "$_id",
"array2": {
$push: {
"type": "$array2.type",
"value": "$array2.value"
}
},
"array1": {
"$first": "$array1"
}
},
}
])
Aggregation
$unwind