docs: def create(obj: PersistedObject, obj_type: Type[Any], arg_name: str):
          """
          Helper method provided because we actually can't put that in the constructor, it creates a bug in Nose tests
          https://github.com/nose-devs/nose/issues/725
  
          :param obj:
          :param obj_type:
          :param arg_name:
          :return:
          """
  
          return MissingMandatoryAttributeFiles('Multifile object ' + str(obj) + ' cannot be built from constructor of '
                                                'type ' + get_pretty_type_str(obj_type) +
                                                ', mandatory constructor argument \'' + arg_name + '\'was not found on '
                                                'filesystem')