“Django 中 / payment_getway/ FOREIGN KEY 约束失败的完整性错误”

Question

我正在开发一个 Django 项目，用户可以在其中下订单，但我遇到了与外键约束相关的

IntegrityError

。

错误：

IntegrityError at /payment_getway/
FOREIGN KEY constraint failed

查看代码：

def payment_getway(request):
    if request.method == "POST":
        user = request.user

        # Retrieve address data from the form
        # address_id = request.POST.get('address_id')  # Make sure you pass this ID in your form

        # Retrieve the address instance
        address_instance = get_object_or_404(Address, user=user)

        # Create a new CartOrder instance
        order = CartOrder(
            user=user,
            full_name=address_instance.name,
            email=address_instance.email,
            mobile=address_instance.mobile,
            address=address_instance,  # Assign the Address instance here
            landmark=address_instance.landmark,
            city=address_instance.region,
            state=address_instance.region,  # Update as per your address model
            postalCode=address_instance.pin,
        )
        order.save()

        cart_total_ammount=0
        if 'cart_data_obj' in request.session:
            for p_id, item in request.session['cart_data_obj'].items():
                cart_total_ammount += int(item['qty']) * float(item['price'])

        #getting total ammount for the cart
        # for p_id, item in request.session['cart_data_obj'].items():
        #     cart_total_ammount += int(item['qty']) * float(item['price'])

            cart_order_products = CartOrderItems.objects.create(
                user=request.user,
                order=order,
                invoice_num= str(order.id), # INVOICE_NO-3
                item=item['title'],
                image=item['image'],
                qty=item['qty'],
                price=item['price'],
                total=float(item['qty']) * float(item['price']),
                # product = Product.objects.get(pid=item['pid'])
            )

        
        # Redirect or render a success page
        return redirect('core:order_confirmation')  # Update with your success URL

    # Render payment page with context
    user = request.user
    addresses = Address.objects.filter(user=user)
    return render(request, "core/payment-getway.html", {"addresses": addresses})

型号：

class CartOrder(models.Model):
    user=models.ForeignKey(CustomUser,on_delete=models.CASCADE)
    sku=ShortUUIDField(length=10,max_length=100,prefix="sku",alphabet="1234567890")
    oid=ShortUUIDField(length=10,max_length=100,prefix="oid",alphabet="1234567890")
    full_name=models.CharField(max_length=100,null=True,blank=True)
    email=models.CharField(max_length=100,null=True,blank=True)
    mobile=models.CharField(max_length=100,null=True,blank=True)
    address=models.CharField(max_length=100,null=True,blank=True)
    landmark=models.CharField(max_length=100,null=True,blank=True)
    city=models.CharField(max_length=100,null=True,blank=True)
    state=models.CharField(max_length=100,null=True,blank=True)
    postalCode=models.CharField(max_length=100,null=True,blank=True)
    item=models.CharField(max_length=100)
    price= models.DecimalField(max_digits=10, decimal_places=2,default="0.00")
    saved= models.DecimalField(max_digits=10, decimal_places=2,default="0.00")
    shipping_method=models.CharField(max_length=100,null=True,blank=True)
    tracking_id=models.CharField(max_length=100,null=True,blank=True)
    tracking_website=models.CharField(max_length=100,null=True,blank=True)
    paid_status=models.BooleanField(default=False)
    stripe_payment_intent=models.CharField(max_length=1000,null=True,blank=True)
    address=models.ForeignKey(Address, on_delete=models.SET_NULL, null=True, blank=True)
    order_date=models.DateTimeField(auto_now_add=True)
    product_status=models.CharField(choices=STATUS_CHOICE, max_length=30,default="processing")

    class Meta:
        verbose_name_plural="Cart Order"

class CartOrderItems(models.Model):
    oid=ShortUUIDField(length=10,max_length=100,prefix="ord",alphabet="abcdef")
    user = models.ForeignKey(CustomUser, on_delete=models.CASCADE)
    vendor = models.ForeignKey(Vendor,on_delete=models.CASCADE,default=False) #I have to fix the default
    order=models.ForeignKey(CartOrder,on_delete=models.CASCADE,related_name="cartorderitems")
    product = models.ForeignKey(Product, on_delete=models.CASCADE, null=True) #added by chatgpt
    invoice_num = models.BigIntegerField(blank=True,null=True)
    product_status=models.CharField(max_length=200)
    item=models.CharField(max_length=100)
    image=models.CharField(max_length=100)
    qty=models.BigIntegerField(default=0)
    price= models.DecimalField(max_digits=12, decimal_places=2,default="15")
    total= models.DecimalField(max_digits=12, decimal_places=2,default="20")
    color=models.ForeignKey(Color,on_delete=models.SET_NULL,null=True,blank=True)
    size=models.ForeignKey(Size,on_delete=models.SET_NULL,null=True,blank=True)



    class Meta:
        verbose_name_plural="Cart Order Items"

    def catagory_image(self):
        return mark_safe('<img src="%s" width="50" height="50"/>'%(self.image.url))
        
    def oder_img(self):
        return mark_safe('<img src="/media/%s" width="50" height="50"/>'%(self.image))

形式：

<div class="address-box">
   <h2>Delivery Address</h2>
   <p><strong>{{ address.name }}</strong></p>
   <p>{{ address.address }}</p>
   <p>{{ address.region }} - {{ address.pin }}</p>
   <p>{{ address.mobile }}</p>
</div>

我尝试过的：

1. 已验证是否从表单中正确传递了

   address_id

   。
2. 检查该地址是否存在并且属于登录用户。

尽管进行了这些检查，我仍然遇到

IntegrityError

。

问题：

1. 我在外键约束方面缺少什么吗？
2. 如何确保地址与

   CartOrder

   实例正确关联？ 任何见解或建议将不胜感激。谢谢！

Answer 1

你没有提供错误信息，所以我提供一个简单的方法。

为所有fk声明

"db_constraint=False"

。