MongoDB $addToSet to deep nested array of object - node.js

Question

Below is my data structure.
{
"_id" : "room1",
"members" : [
{
"_id" : "member1",
"name" : "Michael",
"payments" : [
{
"month": "2018/09"
"amount": "20"
}
]
},
]
}
I want to push below object to Michael's payments
{
"month": "2018/09",
"amount": "5000"
}
In this case, What I want to is overwrite object, because month: "2018/09" already exist. Like below :
{
"_id" : "room1",
"members" : [
{
"_id" : "member1",
"name" : "Michale",
"payments" : [
{
"month": "2018/09"
"amount": "5000"
}
]
},
]
}
And, In case when I want to push object that not exist same month in payments, I want to add this object to payments.
{
"month": "2018/10",
"amount": "2000"
}
So the expected result is
{
"_id" : "room1",
"members" : [
{
"_id" : "member1",
"payments" : [
{
"month": "2018/09"
"amount": "5000"
},
{
"month": "2018/10"
"amount": "2000"
}
]
},
]
}
I tried like below, but it's not working. My code generate duplicated new month object every time I tried. How can I do this properly?
Rooms.update(
{
_id: "room1",
"members._id": "member1",
"members.$.payments": {
$not: {
$elemMatch: {
month: req.body.month
}
}
}
},
{
$addToSet: {
"members.$.payments": {
month: req.body.month,
amount: req.body.value
}
}
},
{ multi: true }, function (err, result) {
console.log(result)
}
)

Answer 1

You can use below command to add without duplicity either in months or amount
Rooms.update(
{
_id: "room1",
"members._id": "member1"
},
{
$addToSet: {
"members.$.payments": {
month: req.body.month,
amount: req.body.value
}
}
},function (err, result) {
console.log(result)
}
)

Answer 2

So I heard I have to determine duplication myself, so below is my code... it's writing now.,,
So Finally this is my code
Clubs.findOne({
uid: req.params.club_id,
"members._id": mongoose.Types.ObjectId(req.params.member_uid)
}, function(err, club){
let member = club.members.filter(el => {
if(el._id.equals(req.params.member_uid)) return el
})
let duplicated = false;
member[0].payments.map(el => {
if(el.month === req.body.month) duplicated = true
})
if(duplicated){
Clubs.update(
{
uid: req.params.club_id,
"members._id": mongoose.Types.ObjectId(req.params.member_uid),
},
{
$set: {
["members.$.payments."+index+".amount"] : req.body.value
}
},
function (err, result, third) {
if (err) throw err
console.log('result')
console.log(result)
res.json({})
}
)
} else {
Clubs.update(
{
uid: req.params.club_id,
"members._id": mongoose.Types.ObjectId(req.params.member_uid),
},
{
$push: {
"members.$.payments" : {
month : req.body.month,
amount: req.body.value
}
}
},
function (err, result, third) {
if (err) throw err
console.log('result')
console.log(result)
res.json({})
}
)
}
})

Answer 3

Perhaps consider changing the structure of your nested array to an object? So change this
{
"payments": [{
"month": "2018/09"
"amount": "5000"
},
{
"month": "2018/10"
"amount": "2000"
}
]
}
to this:
{
"payments": {
"2018/09": "5000",
"2018/10": "2000"
}
}
Then you can do a simple update:
Rooms.update({
_id: "room1",
"members._id": "member1",
"members.payments": {
$exists: true
}
}, {
$set: {
"members.payments." + req.body.month: req.body.value
}
},
)