fiux

core/apps/orders/signals/party.py

@@ -0,0 +1,12 @@
+from django.db.models.signals import post_save
+from django.dispatch import receiver
+
+from core.apps.orders.models import Party
+
+
+@receiver(post_save, sender=Party)
+def set_party_number(sender, instance, created, **kwargs):
+    if created:
+        last_party = Party.objects.order_by('number').last()
+        instance.number = (last_party.number + 1) if last_party else 1
+        instance.save(update_fields=["number"])