Polymorphic FK should be explicitly overridden

Author: Anton-Shutik

example/views.py

@@ -203,6 +203,9 @@ def get_queryset(self, *args, **kwargs):
 class CompanyViewset(ModelViewSet):
     queryset = Company.objects.all()
     serializer_class = CompanySerializer
+    prefetch_for_includes = {
+        'current_project': ['current_project'],
+    }
 
 
 class ProjectViewset(ModelViewSet):