fix

alkatorapi/views.py

@@ -125,14 +125,12 @@ def register_racer(request):
 
     product.quantity -= 1
     product.save()
-
     invoice = Invoice(
         invoice_id=invoice_id,
         user=user,
         total_price=price,
         address=profile.address,
     )
-    racer.save()
     racer = Racer(
         product=product,
         invoice=invoice,
@@ -147,8 +145,9 @@ def register_racer(request):
         alkator_class = ALKATOR_CLASS,
         price=price,
     )
-    invoice.items.set([racer])
     invoice.save()
+    racer.save()
+    invoice.items.set([racer])
 
     payment_data = {
         'merchant': COMGATE_MERCHANT,