mongodb aggregation matching properties - mongodb

Question

I have a user_status collection and its schema is like this
const userStatus = mongoose.model(
'user_status',
new mongoose.Schema(
{
user: {
type: mongoose.Schema.Types.ObjectId,
required: true,
ref: 'user'
},
isActive: {
type: Boolean,
default: false
}
},
{ timestamps: true }
)
);
I need to get all the active users count for a given specific month (1, 2, etc..)
I tried this. But this snippet is not giving expected output
// get all active user count for a specific month
router.post('/report', async (req, res) => {
const selectedMonth = req.body.month;
console.log('month', selectedMonth);
const usersStatus = await UserStatus.aggregate([
{ $project: { month: { $month: '$updatedAt' } } },
{
$match: { $and: [{ month: { $eq: selectedMonth } }, { isActive: true }] }
},
{ $group: { _id: '$user', count: { $sum: 1 } } }
]).exec();
res.status(200).send(usersStatus);
});
Could you please tell me where I'm wrong?

Answer 1

You have vanished the isActive and user field after the first $project stage
You can use below aggregation
const usersStatus = await UserStatus.aggregate([
{ "$addFields": { "month": { "$month": "$updatedAt" } } },
{ "$match": { "month": selectedMonth, "isActive": true }},
{ "$group": { "_id": "$user", "count": { "$sum": 1 } } }
])
Or even more convenient way using $expr
const usersStatus = await UserStatus.aggregate([
{ "$match": {
"$expr": {
"$and": [
{ "$eq": [{ "$month": "$updatedAt" }, selectedMonth] },
{ "$eq": ["$isActive", true] }
]
}
}},
{ "$group": { "_id": "$user", "count": { "$sum": 1 } } }
])