feat(orders): transfer money in model

apps/orders/models.py

@@ -4,8 +4,9 @@
 from django.conf import settings
 from django.db.models import QuerySet
 from uuid import uuid4
-from orders.exceptions import EmptyCartException, InsufficientBalanceException
+from orders.exceptions import EmptyCartException
 from orders.enums import OrderStatus
+from transactions.models import Transaction
 from restaurants.models import Restaurant
 from products.models import Product
 
@@ -25,10 +26,11 @@ def __str__(self):
 
     def save(self, *args, **kwargs):
         if self.status == OrderStatus.PROCESSING and not self.is_removed_from_balance:
-            if self.user.balance < self.total_price:
-                raise InsufficientBalanceException
-            self.user.balance -= self.total_price
-            self.user.save()
+            Transaction.transfer(
+                sender=self.user,
+                receiver=self.restaurant.owner,
+                amount=self.total_price,
+            )
         return super().save(*args, **kwargs)
 
     @classmethod

apps/orders/views/customer.py

@@ -6,7 +6,7 @@
 from rest_framework import status
 from drf_spectacular.utils import extend_schema_view, OpenApiResponse, extend_schema
 from orders.enums import OrderStatus
-from orders.exceptions import InsufficientBalanceException
+from transactions.exceptions import InsufficientBalanceError
 from orders.models import Order
 from orders.serializers import OrderSerializer
 
@@ -80,7 +80,7 @@ def post(self, request, *args, **kwargs):
             order.save()
             return Response({"message": "Order is being processed"}, status=status.HTTP_200_OK)
 
-        except InsufficientBalanceException:
+        except InsufficientBalanceError:
             return Response({"error": "Insufficient balance"}, status=status.HTTP_400_BAD_REQUEST)