gold eggs backend

core/apps/eggs/utils/signals.py

@@ -0,0 +1,34 @@
+from django.db.models.signals import post_save
+from django.dispatch import receiver
+
+from core.apps.eggs.models.order import Order
+
+
+@receiver(post_save, sender=Order)
+def update_order_status(sender, instance, created, **kwargs):
+    if created:
+        if instance.courier_id is None:
+            Order.objects.filter(id=instance.id).update(status="pending")
+        elif instance.courier_id is not None and instance.status == "pending":
+            Order.objects.filter(id=instance.id).update(status="delivery")
+    else:
+        if instance.courier_id is not None and instance.status == "pending":
+            Order.objects.filter(id=instance.id).update(status="delivery")
+        if instance.status == "success":
+            order_items = instance.order_items.all()
+            for item in order_items:
+                if item.courier_product_id:
+                    if item.courier_product_id.count < item.count:
+                        print(item.courier_product_id.count, item.count)
+                        raise ValueError(
+                            "Count cannot be greater than courier product count"
+                        )
+                    item.courier_product_id.count -= item.count
+                    print(item.courier_product_id.count, item.count)
+                    item.courier_product_id.save()
+
+        if (
+            instance.price == instance.price_paid
+            and instance.status == "success"
+        ):
+            Order.objects.filter(id=instance.id).update(status="done")