add: add new field to order model

core/apps/orders/models.py

@@ -12,6 +12,7 @@ class Order(BaseModel):
         ('Yetkazib berilgan', 'Yetkazib berilgan')
     )
 
+    order_number = models.PositiveBigIntegerField(default=1)
     user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='orders')
     name = models.CharField(max_length=200)
     date = models.DateField()
@@ -20,10 +21,21 @@ class Order(BaseModel):
     total_price = models.PositiveBigIntegerField()
     is_paid = models.BooleanField(default=False)
     location = models.CharField(max_length=200)
+    location_to = models.CharField(max_length=200, null=True)
+    location_from = models.CharField(max_length=200, null=True)
 
     def __str__(self):
         return f'{self.user} user order {self.name}'
     
+    def save(self, *args, **kwargs):
+        if not self.order_number:
+            last_order = Order.objects.all().order_by('-order_number').first()
+            if last_order:
+                self.order_number = last_order.order_number + 1
+            else:
+                self.order_number = 1
+        super().save(*args, **kwargs)
+    
     class Meta:
         verbose_name = 'Buyurtma'
         verbose_name_plural = 'buyurtmalar'