fix ranvher invetory entry bug for existence of rancher - set pagination message

apps/warehouse/pos/api/v1/api.py

@@ -58,18 +58,25 @@ class InventoryEntryViewSet(viewsets.ModelViewSet, DynamicSearchMixin, POSDevice
     )
     @transaction.atomic
     def rancher_inventory_entries(self, request):
-        """ """
+        """ list of inventory entries (quotas) for rancher """
+
         organization = self.get_device_organization()
         device = self.get_pos_device()
-        rancher = Rancher.objects.filter(national_code=request.GET['national_code']).first()
+        rancher = Rancher.objects.filter(national_code=request.GET['national_code'])
         entries = self.queryset.filter(organization=organization)
 
-        available_entries = [entry for entry in entries if can_buy_from_inventory(rancher, entry)]
+        # check quota inventory entries for rancher
+        available_entries = [
+            entry for entry in entries if (can_buy_from_inventory(rancher.first(), entry) & rancher.exists())
+        ]
 
         # paginate & response
         page = self.paginate_queryset(available_entries)
         if page is not None:
-            serializer = self.get_serializer(page, many=True, context={'rancher': rancher, 'device': device})
+            serializer = self.get_serializer(page, many=True, context={'rancher': rancher.first(), 'device': device})
+            # set custom message for paginator
+            if not available_entries:
+                self.paginator.set_message("دامدار با کد ملی مد نظر یافت نشد")  # noqa
             return self.get_paginated_response(serializer.data)