code: def fetch_objects(self, geoids):
          '''
          Custom object retrieval.
  
          Zones are resolved from their identifier
          instead of the default bulk fetch by ID.
          '''
          zones = []
          no_match = []
          for geoid in geoids:
              zone = GeoZone.objects.resolve(geoid)
              if zone:
                  zones.append(zone)
              else:
                  no_match.append(geoid)
  
          if no_match:
              msg = _('Unknown geoid(s): {identifiers}').format(
                  identifiers=', '.join(str(id) for id in no_match))
              raise validators.ValidationError(msg)
  
          return zonef fetch_objects(self, geoids):
          '''
          Custom object retrieval.
  
          Zones are resolved from their identifier
          instead of the default bulk fetch by ID.
          '''
          zones = []
          no_match = []
          for geoid in geoids:
              zone = GeoZone.objects.resolve(geoid)
              if zone:
                  zones.append(zone)
              else:
                  no_match.append(geoid)
  
          if no_match:
              msg = _('Unknown geoid(s): {identifiers}').format(
                  identifiers=', '.join(str(id) for id in no_match))
              raise validators.ValidationError(msg)
  
          return zones
docs: Custom object retrieval.
  
          Zones are resolved from their identifier
          instead of the default bulk fetch by ID.