MongoDB - group inside group && group and project - laravel

Question

I'm a newer and studying MongoDB with Laravel.
This is my problem.
I need to get records in 60 days and group them by type.
In each type group, I have to group them by range time:
60 - 30 days ago
30 days ago - now
I researched in 2 days and these are my codes so far.
$collection->aggregate([
[
'$match' => $match,
],
[
'$project' => [
'range' => [
'$concat' => [
[
'$cond' => [
[
'$and' => [
['$gte' => ['$created_at', $ago_60_days]],
['$lte' => ['$created_at', $ago_30_days]],
],
],
'before',
'',
],
],
[
'$cond' => [
[
'$and' => [
['$gt' => ['$created_at', $ago_30_days]],
['$lte' => ['$created_at', $now]],
],
],
'current',
'',
],
],
],
],
],
],
[
'$group' => [
'_id' => '$type,
'total' => ['$sum' => 1],
],
],
... anything after ???
]);
Please let me know anything, any clues could help me.
I can handle with mongo shell.
Thank you guys so much.

Answer 1

The query:
db.test.aggregate( [
{
$match: {
$expr: {
$gte: [ "$dt", { $subtract: [ ISODate(), 60*24*60*60*1000 ] } ]
}
}
},
{
$addFields: {
rangeTime: {
$cond: {
if: { $gte: [ "$dt", { $subtract: [ ISODate(), 30*24*60*60*1000 ] } ] },
then: "range_30_now",
else: "range_60_30"
}
}
}
},
{
$group: {
_id: {
t: "$type", r: "$rangeTime"
},
total: { $sum: 1 }
}
},
{
$project: {
type: "$_id.t",
rangeTime: "$_id.r",
total: 1,
_id: 0
}
},
{
$sort: {
type: 1,
rangeTime: -1
}
}
] )
The Output:
{ "total" : 2, "type" : "A", "rangeTime" : "range_60_30" }
{ "total" : 1, "type" : "B", "rangeTime" : "range_60_30" }
{ "total" : 2, "type" : "B", "rangeTime" : "range_30_now" }
The Input Documents:
{ "_id" : 1, "dt" : ISODate("2019-10-15T00:00:00Z"), "type" : "A" }
{ "_id" : 2, "dt" : ISODate("2019-10-20T00:00:00Z"), "type" : "B" }
{ "_id" : 3, "dt" : ISODate("2019-11-08T00:00:00Z"), "type" : "A" }
{ "_id" : 4, "dt" : ISODate("2019-11-29T00:00:00Z"), "type" : "B" }
{ "_id" : 5, "dt" : ISODate("2019-11-15T00:00:00Z"), "type" : "A" }
{ "_id" : 9, "dt" : ISODate("2019-12-15T00:00:00Z"), "type" : "B" }