/add-to-cart/test-product1 处的 FieldError

Question

大家好，我需要帮助，在尝试我的 dd to cart 按钮时，我收到了这条消息。

/add-to-cart/test-product1/ 处的字段错误 无法将关键字“有序”解析为字段。选项有：id、item、item_id、order、quantity

my views.py for the add to cart function.

def add_to_cart(request, slug):
    item = get_object_or_404(Item, slug=slug)
    order_item, created = OrderItem.objects.get_or_create(
        item=item,
        user=request.user,
        ordered=False
    )
    order_qs = Order.objects.filter(user=request.user, ordered=False)
    if order_qs.exists():
        order = order_qs[0]
        # check if the order item is in the order
        if order.items.filter(item__slug=item.slug).exists():
            order_item.quantity += 1
            order_item.save()
        else:
            ordered_date = timezone.now()
            order = Order.objects.create(user=request.user, 
                           ordered_date=ordered_date)
            order.items.add(order_item)
        return redirect("store:product", slug=slug)

我的模型.py

class Order(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL,
                             on_delete=models.CASCADE)
    item = models.ManyToManyField(OrderItem)
    start_date = models.DateTimeField(auto_now_add=True)
    ordered_date = models.DateTimeField()
    ordered = models.BooleanField(default=False)

    def __str__(self):
       return self.user.username

Answer 1

您正在尝试在 OrderItem 模型上执行 get_or_create。但是，此模型不包含字段 ordered（正如您的评论中所确认的那样）。 ordered 字段仅存在于 Order 模型中，因此 Django 会引发异常说该字段不存在于模型中。

Answer 2

then include all naming's to your view.py.```

```my views```
```in the views.py in my cart function, I used the order, 
created method whereby i queried my Order Class model from my model.py. 
then I made sure that the object that is being called has also be 
mentioned also in my model class. just like the customer object. 
if the object been called hasn't been mentioned you are must
 likely to get a field error.```

    def cart(request):
        
        if request.user.is_authenticated:
            customer = request.user.customer
            order, created = Order.objects.get_or_create(customer=customer, complete=False)
            items = order.orderitem_set.all()
        else:
            items = []
    
        context = {'items':items}
        return render(request, 'shop/cart.html', context)
    
    class Order(models.Model):
        customer = models.ForeignKey(Customer, on_delete=models.SET_NULL, null=True)
        date_ordered = models.DateTimeField(auto_now_add=True)
        complete = models.BooleanField(default=False, null=True, blank=False)
        transaction_id = models.CharField(max_length=200, null=True)
    
        def __str__(self):
            return str(self.id)

    class OrderItem(models.Model):
        product = models.ForeignKey(Product, on_delete=models.SET_NULL, null=True)
        order = models.ForeignKey(Order, on_delete=models.SET_NULL, null=True)
        quantity = models.IntegerField(default=0, null=True, blank=True)
        date_added = models.DateTimeField(auto_now_add=True)
    
        def __str__(self):
            return str(self.product.id)