MongoDB: bulk create or update - mongodb

Question

I have an array of data that I want to insert in my database:
[
{
"id":"816307",
"email": "john.doe#test.com",
"firstName": "John",
"lastName": "Doe"
},
{
"id":"391650",
"email": "mary#williams",
"firstName": "Mary",
"lastName": "Williams"
},
{
"id":"183751",
"email": "paul.smith#test.com",
"firstName": "Paul",
"lastName": "Smith"
},
]
I know that I can use the .create method from mongoose to insert all the data.
However, in the data, I need to be able to have a combination of new values and existing values. For example, if a user with id 816307 (John Doe) already exists but have a different email it should update the value and at the same time if a user with id 391650 (Mary Williams) does not exist it should create it.
The id field cannot be updated.
It seems like the best method to use is currently updateMany and to use the upsert option to insert new elements at the same time .updateMany().
But, how to do to reference the id? I cannot use $eq and hardcode anything here, I would like that the document automatically finds the proper item by its id and update it if it exists, otherwise, create it.

Answer 1

Since each object has it's own filter & update, then you might not be able to do it using .updateMany(), instead you can use MongoDB's .bulkWrite(), with which you could do things in one DB call, internally MongoDB would do multiple write ops.
Try below code :
let input = [
{
id: "816307",
email: "john.doe#test.com",
firstName: "John",
lastName: "Doe",
},
{
id: "391650",
email: "mary#williams",
firstName: "Mary",
lastName: "Williams",
},
{
id: "183751",
email: "paul.smith#test.com",
firstName: "Paul",
lastName: "Smith",
},
];
let bulkArr = [];
input.forEach((each) => {
bulkArr.push({
updateOne: {
filter: each.id,
update: {
$set: {
email: each.email,
firstName: each.firstName,
lastName: each.lastName,
},
},
upsert: true,
},
});
});
db.collection.bulkWrite(bulkArr)