docs: def _filter_queryset(self, queryset):
          """Filter queryset by entity, label and position.
  
          Due to a bug in django-filter these filters have to be applied
          manually:
          https://github.com/carltongibson/django-filter/issues/883
          """
          entities = self.request.query_params.getlist('entity')
          labels = self.request.query_params.getlist('label')
          positions = self.request.query_params.getlist('position')
  
          if labels and len(labels) != len(entities):
              raise exceptions.ParseError(
                  'If `labels` query parameter is given, also `entities` '
                  'must be given and they must be of the same length.'
              )
  
          if positions and len(positions) != len(entities):
              raise exceptions.ParseError(
                  'If `positions` query parameter is given, also `entities` '
                  'must be given and they must be of the same length.'
              )
  
          if entities:
              for entity, label, position in zip_longest(entities, labels, positions):
                  filter_params = {'entities__pk': entity}
                  if label:
                      filter_params['relationpartition__label'] = label
                  if position:
                      filter_params['relationpartition__position'] = position
  
                  queryset = queryset.filter(**filter_params)
  
          return queryset