new checker for remaining tickets

alkatorapi/models.py

@@ -64,6 +64,9 @@ class Product(models.Model):
     price = models.IntegerField()
     quantity = models.IntegerField()
 
+    def __str__(self):
+        f"<Product {self.name} {self.price} Kč zbývá {self.quantity}>"
+
 
 class Cart(models.Model):
     user = models.ForeignKey(DjangoUser, on_delete=models.RESTRICT)

alkatorapi/views.py

@@ -93,8 +93,6 @@ def register_racer(request):
         return HttpResponse('{"reason":"Jméno je povinné!"}', status=400, content_type='application/json')
     if not request.POST['last_name']:
         return HttpResponse('{"reason":"Přijmení je povinné!"}', status=400, content_type='application/json')
-    if Racer.objects.filter(alkator_class=ALKATOR_CLASS, paid=True).count() >= 100:
-        return HttpResponse('{"reason":"Kapacita závodu byla naplněna!"}', status=400, content_type='application/json')
     try:
         dob = datetime.strptime(request.POST['date_of_birth'], "%Y-%m-%d").date()
         if dob > date(2006, 10, 5):
@@ -122,6 +120,12 @@ def register_racer(request):
     product = Product.objects.get(id=1)
     price = product.price
 
+    if product.quantity <= 0:
+        return HttpResponse('{"reason":"Jsme vyprodaní!"}', status=400, content_type='application/json')
+
+    product.quantity -= 1
+    product.save()
+
     racer = Racer(
         product=product,
         quantity=1,