MongoDB Schema and pymongo

I need to keep couple of strings inside mongoDB. I have temporary schema of document in attachment. ([login to view URL]) Need to prepare 2 python methods which will be get set of arguments (instance_id, name and guid) and create or update records inside mongo collection. instance_id = unique instance identifier (string) guid = id of document (string) name = name of instance (string) documents must be filtered thru guid, this is "ObjectId()" Example: def set_instance(self, instance_id, guid,instance_name): key = self.gen_code() #My code self.col.update_one(filter={"_id": ObjectId(guid)}, update={"$push": {"instances": { instance_id: { "instance_name": , "key": key } }}}) First function must create new records in document. Second function must update existing record (instance_id) in document. Schema could be tune if needed but only for "instances" If you want to modify "instances" from object to array for example, YW. At the end I want to receive 2 functional methods for set and update and good schema of document.