Mongodb update nested array by key-value - arrays

Question

How can I update nested array by list key value?
{
"_id": "mainId",
"events": [{
"id": 1,
"profile": 10,
} {
"id": 2,
"profile": 10,
} {
"id": 3,
"profile": 20,
}
]
}
and I have a list to update:
var list = {id: 2, newval: 222}, {id: 3, newval: 333}
How can I do an update in one query? Or in MongoDB, it will be like a loop?
for({id, val} in list){
update({_id: "mainId", events.$.id: id}, {setField: {events.$.profile: val}})
}

Answer 1

If you have a copy of the events array, you could make the necessary updates in your code and then send the updated array to MongoDB in a single query. Something like this
db.Test.updateOne({_id: "mainId"}, {$set: { "events": [{id: 1, profile: 222}, {id: 2, profile: 10}, {id: 3, profile: 333}] } } )
If you don't have a copy of the events array, you could do a bulk operation. Something like
db.Test.bulkWrite(
[
{ updateOne : {
"filter": {_id: "mainId", "events.id": 1},
"update": { $set: { "events.$.profile": 222 } }
}
},
{ updateOne : {
"filter": {_id: "mainId", "events.id": 3},
"update": { $set: { "events.$.profile": 333 }}
}
}
]
)
For more on bulkWrite, see the MongoDB docs: https://docs.mongodb.com/manual/core/bulk-write-operations/#bulkwrite-methods