code: def save_partial(self, data=None, allow_protected_fields=False, **kwargs):
          
  
          # Backwards compat, deprecated argument
          if "dotnotation" in kwargs:
              del kwargs["dotnotation"]
  
          if data is None:
  
              data = dotdict(self)
              if "_id" not in data:
                  raise KeyError("_id must be set in order to do a save_partial()")
              del data["_id"]
  
          if len(data) == 0:
            return
  
          if not allow_protected_fields:
              self.mongokat_collection._check_protected_fields(data)
  
          apply_on = dotdict(self)
  
          self._initialized_with_doc = False
  
          self.mongokat_collection.update_one({"_id": self["_id"]}, {"$set": data}, **kwargs)
  
          for k, v in data.items():
              apply_on[k] = v
  
          self.update(dict(apply_on))
docs: Saves just the currently set fields in the database.