code: def fetch(self, only_ref=False):
          
          if self.ref:
              reply = self.connector.get_object(
                  self.ref, return_fields=self.return_fields)
              if reply:
                  self.update_from_dict(reply)
                  return True
  
          search_dict = self.to_dict(search_fields='update')
          return_fields = [] if only_ref else self.return_fields
          reply = self.connector.get_object(self.infoblox_type,
                                            search_dict,
                                            return_fields=return_fields)
          if reply:
              self.update_from_dict(reply[0], only_ref=only_ref)
              return True
          return False
docs: Fetch object from NIOS by _ref or searchfields
  
          Update existent object with fields returned from NIOS
          Return True on successful object fetch