NODE-4387 Description

What problem are you facing?

I'm trying to upsert a document using the method `findOneAndUpdate` without having an _id: null. I've tried using the $setOnInsert clause but it seems that since the _id should not be manually set the operation is failing.

What driver and relevant dependency versions are you using?

NodeJS client: 3.6.3

Mongodb server: 5.0.4

Steps to reproduce?

 
const updateClause= {
  $set: omit(update, '_id'),
  // forbidden
{{  $setOnInsert: { _id: newObjectId() }}}
};{}const res= await this.collection.findOneAndUpdate(
{{

, }}
updateClause, {
 upsert: true,
 returnOriginal: false
});
 

Running that, I get this error:

 
Performing an update on the path '_id' would modify the immutable field '_id'
That said, I cannot upsert a document with an id that is not null. If I try this operation without the $setOnInsert I get the document with _id: null.