Patch items in MongoDB with upsert option does not return patched items as result

[claustres]

The MongoDB adapter allow to pass specific MongoDB options in params.mongodb. When updating items MongoDB support the upsert option in order to create them if not already exist. However, in this specific case, when patching items not yet existing with the upsert option the adapter will not return any result as it seems to retrieve the list of patched object first, which is empty.

Not sure why the list of patched items is retrieved first instead of once patched, maybe a specific check should be done on the upsert option to use the most appropriate way to retrieve the patched objects.