сделал метод ретрив

server/proj/rubricks/views.py

@@ -1,5 +1,6 @@
 from rest_framework.viewsets import ViewSet
 from .models import Rubric
+from django.shortcuts import get_object_or_404
 from .serializers import RubricSerializer
 from rest_framework.response import Response
 from rest_framework import status
@@ -10,4 +11,9 @@ class RubricViewSet(ViewSet):
         serializer = RubricSerializer(queryset, many=True)
         return Response(serializer.data, status=status.HTTP_200_OK)
     
+    def retrieve(self, request, pk=None):
+        queryset = Rubric.objects.filter(id=pk)
+        serializer = RubricSerializer(queryset)
+        
+        return Response(serializer.data, status=status.HTTP_200_OK)