Change lookup field to id and add get_one by slug

competition/views.py

@@ -12,6 +12,7 @@
 from rest_framework.decorators import action
 from rest_framework.exceptions import ValidationError
 from rest_framework.permissions import IsAdminUser, IsAuthenticated
+from rest_framework.request import Request
 from rest_framework.response import Response
 
 from base.utils import mime_type
@@ -107,9 +108,15 @@ class CompetitionViewSet(mixins.RetrieveModelMixin,
     """Naše aktivity"""
     queryset = Competition.objects.all()
     serializer_class = CompetitionSerializer
-    lookup_field = 'slug'
     permission_classes = (CompetitionRestrictedPermission,)
 
+    @action(detail=False, url_path=r'slug/(?P<slug>\w+)')
+    def slug(self, request: Request, slug: str = None) -> Response:
+        competition: Competition = self.get_queryset().get(slug=slug)
+        return Response(
+            CompetitionSerializer(competition, many=False).data
+        )
+
 
 class CommentViewSet(
     mixins.RetrieveModelMixin,