docs: def update(self, id, newObj):
          """Update a object
              Args:
                  id (int): Target Object ID
                  newObj (object): New object will be merged into original object
              Returns:
                  Object: Updated object
                  None: If specified object id is not found
                  MultipleInvalid: If input object is invaild
          """
          newObj = self.validation(newObj)
          for obj in self.model.db:
              if obj["id"] != id:
                  continue
  
              newObj.pop("id", None)
              obj.update(newObj)
              obj = self._cast_model(obj)
              if not self._batch.enable.is_set():
                  self.model.save_db()
              return obj
  
          return None