Check if id exists then either update or create

[polluterofminds]

I am sure this has to be possible but I have not been able to make heads or tails of how to do it. I would like to check if an id already exists in the db, and if it does, I'd like to update it. Otherwise, I'd like to create a new item in the db with the given id.

I tried this:

if(mydb.read(idToCheck)) {
  mydb.update(idToCheck, { data: dataToPost })
} else {
  mydb.create({ _id: idToCheck, data: dataToPost })
}

But that returns true every time even if the id does not exist in the db. Any tips?

[ngohoaiphuong]

mydb.read(idToCheck).then(
(response) => {
response === undefined ? mydb.create({ _id: idToCheck, data: dataToPost }) : mydb.update(idToCheck, { data: dataToPost })
}
)