old_contents: from rest_framework import viewsets
  from django_filters import filters, filterset
  
  from api.v09.views import ResultsSetPagination
  
  from ..models import CandidateResult, ResultSet
  from ..serializers import CandidateResultSerializer, ResultSetSerializer
  
  
  class CandidateResultViewSet(viewsets.ModelViewSet):
      queryset = CandidateResult.objects.select_related(
          "membership__party", "membership__post", "membership__person"
      ).order_by("id")
      serializer_class = CandidateResultSerializer
      pagination_class = ResultsSetPagination
  
  
  class ProductFilter(filterset.FilterSet):
      election_id = filters.CharFilter(name="post_election__election__slug")
      election_date = filters.DateFilter(
          name="post_election__election__election_date"
      )
  
      class Meta:
          model = ResultSet
          fields = ["election_date", "election_id"]
  
  
  class ResultSetViewSet(viewsets.ModelViewSet):
      queryset = ResultSet.objects.select_related(
          "post_election__post", "user"
      ).order_by("id")
      serializer_class = ResultSetSerializer
      pagination_class = ResultsSetPagination
  
      filter_class = ProductFilter
  
new_contents: from rest_framework import viewsets
  from django_filters import filters, filterset
  
  from api.v09.views import ResultsSetPagination
  
  from ..models import CandidateResult, ResultSet
  from ..serializers import CandidateResultSerializer, ResultSetSerializer
  
  
  class CandidateResultViewSet(viewsets.ModelViewSet):
      queryset = CandidateResult.objects.select_related(
          "membership__party", "membership__post", "membership__person"
      ).order_by("id")
      serializer_class = CandidateResultSerializer
      pagination_class = ResultsSetPagination
  
  
  class ResultSetFilter(filterset.FilterSet):
      election_id = filters.CharFilter(field_name="post_election__election__slug")
      election_date = filters.DateFilter(
          field_name="post_election__election__election_date"
      )
  
      class Meta:
          model = ResultSet
          fields = ["election_date", "election_id"]
  
  
  class ResultSetViewSet(viewsets.ModelViewSet):
      queryset = ResultSet.objects.select_related(
          "post_election__post", "user"
      ).order_by("id")
      serializer_class = ResultSetSerializer
      pagination_class = ResultsSetPagination
  
      filter_class = ResultSetFilter
  
subject: Update filter args and fix name