docs: def delete(self, request, pzone_pk, operation_pk):
          """Remove an operation from the given pzone."""
  
          # note : we're not using the pzone_pk here since it's not actually
          #   necessary for getting an operation by pk, but it sure makes the urls
          #   nicer!
  
          # attempt to delete operation
          try:
              operation = PZoneOperation.objects.get(pk=operation_pk)
          except PZoneOperation.DoesNotExist:
              raise Http404("Cannot find given operation.")
  
          # delete operation
          operation.delete()
  
          # successful delete, return 204
          return Response("", 204)