Update object with value of array - node.js

Question

For a project where we have actions and donations. We store the donations in an array in the related action. For the connection we use Mongoose.
The schema for an action is as follows, for readability I've removed some fields which are not related to this problem:
const donationSchema = new Schema(
{
id: {
type: String,
unique: true,
required: true,
index: true,
},
amount: { type: Number },
status: {
type: String,
enum: ['pending', 'collected', 'failed'],
default: 'pending',
},
},
{ timestamps: true, versionKey: false, _id: false },
);
const schema = new Schema(
{
donations: { type: [donationSchema], default: [] },
target: { type: Number, default: 0 },
collected: { type: Number, default: 0 },
},
{
timestamps: true,
versionKey: false,
},
);
const Action = model<IAction>('Action', schema);
Let say I have an Action with three donations, one in every state:
{
"_id": "6098fb22101f22cfcbd31e3b"
"target": 10000,
"collected": 25,
"donations": [
{
"uuid": "dd90f6f1-56d7-4d8b-a51f-f9e5382d3cd9",
"amount": 25,
"status": "collected"
},
{
"uuid": "eea0ac5e-1e52-4eba-aa1f-c1f4d072a37a",
"amount": 10,
"status": "failed"
},
{
"uuid": "215237bd-bfe6-4d5a-934f-90e3ec9d2aa1",
"amount": 50,
"status": "pending"
}
]
}
Now I want to update the pending donation to collected.
This would be
Action.findOneAndUpdate(
{
_id: '6098fb22101f22cfcbd31e3b',
'donations.id': '215237bd-bfe6-4d5a-934f-90e3ec9d2aa1',
},
{
$set: {
'donations.$.status': 'collected',
},
},
{
upsert: false,
returnOriginal: false,
}
).then((action) => console.log(action);
I want to update the status to collected, but also update the collected so that it is the same as all the donations with status equal to collected. I thought of using the $inc operator, but this keeps saying that donations.$.amount is not a number and therefore not able to increment collected.
Is there a way to do this in the same update call? The reason why I cannot get the object and just count collected amount is that maybe two donation callbacks occur at the same time, so we don't want the to overwrite the previous given amount.

Answer 1

This aggregation can help you I believe:
db.collection.aggregate([
{
"$match": {
_id: "6098fb22101f22cfcbd31e3b"
}
},
{
"$set": {
"donations.status": {
"$reduce": {
"input": "$donations",
"initialValue": {
uuid: "215237bd-bfe6-4d5a-934f-90e3ec9d2aa1"
},
"in": {
$cond: [
{
$eq: [
"$$this.uuid",
"$$value.uuid"
]
},
"collected",
"$$this.status"
]
}
}
}
}
},
{
"$set": {
"collected": {
"$reduce": {
"input": "$donations",
"initialValue": "$collected",
"in": {
$cond: [
{
$eq: [
"$$this.status",
"collected"
]
},
{
$sum: [
"$$value",
"$$this.amount"
]
},
"$$value"
]
}
}
}
}
}
])
Edit: Above aggregation wasn't properly update status field to "collected" dunno why..
But update query below should work. I couldn't test it too. So, please let me know if something goes wrong.
db.collection.update({
"_id": "6098fb22101f22cfcbd31e3b"
},
{
"$set": {
"donations.$[element].status": "collected",
"$inc": {
"donations.$[element].amount": {
"$cond": [
{
"$eq": [
"donations.$[element].status",
"collected"
]
},
"donations.$[element].amount",
"collected"
]
}
}
}
},
{
"arrayFilters": [
{
"element.uuid": "215237bd-bfe6-4d5a-934f-90e3ec9d2aa1"
}
]
})