Use group by on a group by result in mongoose - node.js

Question

I am working on a NodeJS and a Mongoose Project and I have the following two schemas.
UserSchema.js
const UserSchema = mongoose.Schema({
name: {
type: String,
required: true,
trim: true,
},
incharge: {
type: String,
enum: ['Adhihariharan', 'Anuja', 'Dhivya', 'Govind', 'Joann'],
required: true
},
)}
ContactSchema.js
const ContactSchema = new mongoose.Schema(
{
name: {
type: String,
trim: true,
required: [true, 'Please add a name'],
},
status: {
type: String,
enum: [
'Not Called',
'Wrong Number',
'Called/Declined',
'Called/Not Reachable',
'Called/Postponed',
'Called/Accepted',
'Emailed/Awaiting Response',
'Emailed/Declined',
'Emailed/Confirmed',
],
default: 'Not Called',
},
user: {
type: mongoose.Schema.ObjectId,
ref: 'User',
required: true,
},
I am looking for a query which would give me a result which looks as the following:
[
{
_id: "5d7a514b5d2c12c7449be048",
name: "Benita",
incharge: "Joann",
statuses: [
{ status: "Not Called", count: 1 },
{ status: "Called/Accepted", count: 1 },
{ status: "Called/Declined", count: 1 },
{ status: "Called/Not Reachable", count: 1 },
]
},
{
_id: "5d7a514b5d2c12c7449be048",
name: "Febia",
incharge: "Dhivya",
statuses: [
{ "Not Called": 2 },
{ "Called/Postponed": 2 },
{ "Called/Declined": 3 },
{ "Called/Not Reachable": 1 },
]
},
... and so on
]
Here, the integer, is the number of times that status appears for a particular user and in charge is the manager in charge of the user. The _id mentioned is the ID of the user.
The _id, user, in charge belong to the UserSchema and the status belongs to the ContactSchema
I have tried the following query:
teams = await Contact.aggregate([
{
$group: {
_id: { user: '$user', status: '$status' },
count: { $sum: '$count' },
},
},
{
$lookup: {
from: 'members',
localField: '_id.user',
foreignField: '_id',
as: 'user',
},
},
{
$unwind: { path: '$user' },
},
{
$project: {
'user.name': 1,
'user.incharge': 1,
count: 1,
},
},
{
$sort: { 'user.incharge': 1, 'user.name': 1 },
},
]);
And the following was the output:
{
_id: { user: 5ff52b10fa237b001c93ef18, status: 'Not Called' },
count: 1,
user: { name: 'Benita', incharge: 'Joann' }
},
{
_id: { user: 5ff4ca05fa237b001c93ef15, status: 'Not Called' },
count: 2,
user: { name: 'Febia', incharge: 'Dhivya' }
},
{
_id: { user: 5ff4ca05fa237b001c93ef15, status: 'Called/Accepted' },
count: 4,
user: { name: 'Febia', incharge: 'Dhivya' }
}
Can someone please help me get the desired result?
Thanks in advance.
EDIT:
I did try #turivishal's approach but this is what I got:-
{
_id: 5ff52b10fa237b001c93ef18,
name: 'Sadana',
incharge: 'Joann',
statuses: [ [Object] ]
},
{
_id: 5ff4ca05fa237b001c93ef15,
name: 'Sudarshan B',
incharge: 'Joann',
statuses: [ [Object], [Object] ]
}
Can you please tell me how I can access the [Object] inside the status array in mongoose so that I can get a result as below...
{
_id: "5ff4ca05fa237b001c93ef15",
name: "Sudarshan B",
incharge: "Joann",
statuses: [
{ "Not Called": 2 },
{ "Called/Postponed": 2 },
]
},

Answer 1

You can try lookup with aggregation pipeline,
$lookup with contact pass _id in let,
$match user id condition
$group by status and get total count
$project to change name of the key and value
$addFields to convert statuses array to object using $arrayToObject
teams = await User.aggregate([
{
$lookup: {
from: "contact",
let: { user: "$_id" },
pipeline: [
{ $match: { $expr: { $eq: ["$$user", "$user"] } } },
{
$group: {
_id: "$status",
count: { $sum: 1 }
}
},
{
$project: {
_id: 0,
k: "$_id",
v: "$count"
}
}
],
as: "statuses"
}
},
{ $addFields: { statuses: { $arrayToObject: "$statuses" } } }
])
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