docs: def mergemessage(self, message):
          """ parse OueueMessage in Model vars """
          if isinstance(message, QueueMessage):
              """ merge queue message vars """
              for key, value in vars(message).items():
                  if not value is None:
                      setattr(self, key, value)
                      if (key == 'content'):
                          content = literal_eval(message.content)
                          for metakey, metavalue in content.items():
                              default = getattr(self, metakey, None)
                              if not default is None:
                                  if isinstance(default, datetime.date):
                                      setattr(self, metakey, safe_cast(metavalue, datetime.date, dformat=self._dateformat))
                                  if isinstance(default, datetime.datetime):
                                      setattr(self, metakey, safe_cast(metavalue, datetime.date, dformat=self._datetimeformat))
                                  else:
                                      setattr(self, metakey, metavalue)