Mongo db transaction query - mongodb

Question

I'm trying to create a mongodb query to see which invoices are paid or not. I would like to add few things to the outcome like:
virtualAmount : original amount - (sum of all creditnotes)
total paid amount : sum of all transactions where delete is false
paid (true/false) : if virtualAmount - total paid amount is 0
I have created mongo playground:
https://mongoplayground.net/p/0OyK_bOZu9X
Anyone know if this is possible?
How to still have the original object when using group?
Is it also possible to create this result with mongoose?

Answer 1

by $unwind array and $group it.
db.collection.aggregate(
[{
$match: {
_id: '62b46391be7c618aa5c9bf86'
}
}, {
$set: {
'transactions': {
$filter: {
'input': '$transactions',
'as': 'item',
'cond': { $eq: ['$$item.deleted', false] }
}
},
}
}, {
$unwind: {
path: '$transactions'
}
}, {
$group: {
_id: '_id',
'total-paid-amount': { $sum: '$transactions.amount.value'},
//keep to next stage
'creditnote': {$first: '$creditnote'},
'original-amount': {$first: '$amount.value'}
}
}, {
$unwind: {
path: '$creditnote'
}
}, {
$group: {
_id: '_id',
'sum-all-creditnotes': {$sum: '$creditnote.amount.value'},
//keep to next stage
'total-paid-amount': {$first: '$total-paid-amount'},
'original-amount': {$first: '$original-amount'}
}
}, {
$addFields: {
'virtual-amount': {$subtract: ['$original-amount','$sum-all-creditnotes']}
}
}, {
$addFields: {
paid: {$eq: [{$subtract: ['$virtual-amount','$total-paid-mount']},0]}
}
}]
result
{
"_id" : "_id",
"sum-all-creditnotes" : 1000,
"total-paid-amount" : 1000,
"original-amount" : 3370,
"virtual-amount" : 2370,
"paid" : false
}
EDIT
or easy way without group
db.collection.aggregate(
[{
$match: {
_id: '62b46391be7c618aa5c9bf86'
}
}, {
$set: {
'transactions': {
$filter: {
'input': '$transactions',
'as': 'item',
'cond': { $eq: ['$$item.deleted', false] }
}
},
}
}, {
$project:
{
'total-paid-amount': { $sum: '$transactions.amount.value' },
'sum-all-creditnotes': { $sum: '$creditnote.amount.value' },
'original-amount': '$amount.value'
}
}, {
$addFields: {
'virtual-amount': { $subtract: ['$original-amount', '$sum-all-creditnotes'] }
}
}, {
$addFields: {
'paid': { $eq: [{ $subtract: ['$virtual-amount', '$total-paid-mount'] }, 0] }
}
}])