Select by category and count by status mongodb - node.js

Question

I have a list of records and want to group by categories and after this count buy isArchived status.
I'm just starting to learn MongoDB and I can't do the query described below, I would appreciate your tips.
This is peace of data.
[
{
"_id": "63356af2d77a56d764f362e4",
"noteName": "string",
"category": "IDEA",
"content": "string",
"isArchived": true,
"createdAt": "2022-09-29T09:52:50.477Z",
"updatedAt": "2022-09-29T09:52:50.477Z",
"__v": 0
},
{
"_id": "63356afad77a56d764f362ea",
"noteName": "string",
"category": "IDEA",
"content": "string",
"isArchived": false,
"createdAt": "2022-09-29T09:52:58.765Z",
"updatedAt": "2022-09-29T09:52:58.765Z",
"__v": 0
},
{
"_id": "63356afbd77a56d764f362ee",
"noteName": "string",
"category": "IDEA",
"content": "string",
"isArchived": false,
"createdAt": "2022-09-29T09:52:59.180Z",
"updatedAt": "2022-09-29T09:52:59.180Z",
"__v": 0
},
{
"_id": "63356b04d77a56d764f362f4",
"noteName": "string",
"category": "TASK",
"content": "string",
"isArchived": false,
"createdAt": "2022-09-29T09:53:08.261Z",
"updatedAt": "2022-09-29T09:53:08.261Z",
"__v": 0
},
{
"_id": "63356b09d77a56d764f362fc",
"noteName": "string",
"category": "TASK",
"content": "string",
"isArchived": true,
"createdAt": "2022-09-29T09:53:13.980Z",
"updatedAt": "2022-09-29T09:53:13.980Z",
"__v": 0
},
{
"_id": "63356b0ad77a56d764f362fe",
"noteName": "string",
"category": "TASK",
"content": "string",
"isArchived": true,
"createdAt": "2022-09-29T09:53:14.445Z",
"updatedAt": "2022-09-29T09:53:14.445Z",
"__v": 0
}]
This is request
getStats() {
const stats = this.noteModel
.aggregate([
{
$group: {
_id: {
category: '$category',
isArchived: '$isArchived',
},
count: {
$sum: 1,
},
},
},
{ $sort: { _id: 1 } },
])
.project({
_id: 0,
category: '$_id.category',
isArchived: '$_id.isArchived',
average: 1,
count: '$count',
});
return stats;
}
Now I receive like this
[
{
"category": "IDEA",
"isArchived": false,
"count": 5
},
{
"category": "IDEA",
"isArchived": true,
"count": 3
},
{
"category": "QUOTE",
"isArchived": false,
"count": 4
},
{
"category": "QUOTE",
"isArchived": true,
"count": 3
},
{
"category": "RANDOM THOUGHT",
"isArchived": false,
"count": 2
},
{
"category": "RANDOM THOUGHT",
"isArchived": true,
"count": 3
}....
]
But I want to receive it like this
[
{
"category": "IDEA",
"archived": 5,
"unArchived": 3
},
{
"category": "QUOTE",
"archived": 5,
"unArchived": 3
},
{
"category": "RANDOM THOUGHT",
"archived": 2,
"unArchived": 3
},
{
"category": "TASK",
"archived": 3,
"unArchived": 3
},
]
What should be changed in the query to get the required view?

Answer 1

Group by category only and calculate the archived and unArchived counts by checking the condition,
archived condition is if isArchived is true then return 1 otherwise 0
unArchived condition is if isArchived is true then return 0 otherwise 1
const stats = this.noteModel.aggregate([
{
$group: {
_id: "$category",
archived: {
$sum: { $cond: ["$isArchived", 1, 0] }
},
unArchived: {
$sum: { $cond: ["$isArchived", 0, 1] }
}
}
},
{ $sort: { _id: 1 } }
])
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