add special_discount_code to order model

backend/order/models.py

@@ -173,6 +173,8 @@ class OrderModel(models.Model):
     is_paid = models.BooleanField(default=False, verbose_name="وضعیت پرداخت")
     discount_code = models.ForeignKey(
         DiscountCode, on_delete=models.PROTECT, null=True, blank=True, verbose_name="کدتخفیف")
+    special_discount_code = models.ForeignKey(
+        SpecialDiscountCode, on_delete=models.PROTECT, null=True, blank=True, verbose_name="کدتخفیف خاص")
     status = models.CharField(max_length=20, choices=STATUS_CHOICES,
                               default='ADMIN_PENDING', verbose_name="وضعیت سفارش")
     discount_amount = models.BigIntegerField(
@@ -290,6 +292,8 @@ class ShopOrderModel(models.Model):
     subtotal = models.BigIntegerField(verbose_name='جمع جزئیات', default=0)
     items_count = models.PositiveIntegerField(default=0)
     discount_amount = models.BigIntegerField(default=0, verbose_name='تخفیف اختصاصی فروشگاه')
+    special_discount_code = models.ForeignKey(
+        'account.SpecialDiscountCode', on_delete=models.PROTECT, null=True, blank=True, verbose_name='کدتخفیف خاص')
     special_discount_amount = models.BigIntegerField(default=0, verbose_name='تخفیف ویژه اختصاصی')
     commission_percent = models.DecimalField(max_digits=5, decimal_places=2, verbose_name='درصد کمیسیون')
     commission_amount = models.BigIntegerField(default=0, verbose_name='مبلغ کمیسیون')