[英]django.db.utils.IntegrityError: FOREIGN KEY constraint failed in django
[英]django.db.utils.IntegrityError: FOREIGN KEY constraint failed
我的模型.py
class Order(models.Model):
user = models.ForeignKey(User, blank=True, null=True, on_delete=models.PROTECT)
customer_email = models.EmailField(blank=True, null=True, default=None)
customer_name = models.CharField(max_length = 64, blank=True, null=True, default=None)
customer_phone = models.CharField(max_length = 48, blank=True, null=True, default=None)
customer_address = models.CharField(max_length = 128, blank=True, null=True, default=None)
total_price = models.DecimalField(max_digits=10, decimal_places=2, default=0) #total price for all products in order
comments = models.TextField(blank=True, null=True, default=None)
status = models.ForeignKey(Status, on_delete=models.PROTECT)
created = models.DateTimeField(auto_now_add=True, auto_now=False)
updated = models.DateTimeField(auto_now_add=False, auto_now=True)
def __str__(self):
return "Заказ %s %s" % (self.id, self.status.name)
class Meta:
verbose_name = "Заказ"
verbose_name_plural = "Заказы"
def save(self, *args, **kwargs):
super(Order, self).save(*args, **kwargs)
我的views.py 。
def checkout(request):
session_key = request.session.session_key
products_in_basket = ProductInBasket.objects.filter(session_key=session_key, is_active=True)
form = CheckoutContactForm(request.POST or None)
if request.POST:
print(request.POST)
if form.is_valid():
print("OK")
data = request.POST
name = data.get("name", "34343434")
phone = data["phone"]
user, created = User.objects.get_or_create(username=phone, defaults={"first_name": name})
order = Order.objects.create(user=user, customer_name=name, customer_phone=phone, status_id=1)
for name, value in data.items():
if name.startswith("product_in_basket_"):
product_in_basket_id = name.split("product_in_basket_")[1]
product_in_basket = ProductInBasket.objects.get(id=product_in_basket_id)
product_in_basket.nmb = value
product_in_basket.order = order
product_in_basket.save(force_update=True)
ProductInOrder.objects.create(
product=product_in_basket.product,
nmb=product_in_basket.nmb,
price_per_item=product_in_basket.price_per_item,
total_price=product_in_basket.total_price,
order=order
)
else:
print("ERROR")
return render(request, 'orders/checkout.html', locals())
錯誤:
Traceback (most recent call last):
File "C:\Users\Nikita Shuliak\AppData\Local\Programs\Python\Python37-
32\lib\site-packages\django-2.1rc1-py3.7.egg\django\core\handlers\exception.py", line 34, in inner
response = get_response(request)
File "C:\Users\Nikita Shuliak\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django-2.1rc1-py3.7.egg\django\core\handlers\base.py", line 126, in _get_response
response = self.process_exception_by_middleware(e, request)
File "C:\Users\Nikita Shuliak\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django-2.1rc1-py3.7.egg\django\core\handlers\base.py", line 124, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\Nikita Shuliak\Desktop\NJB\startup\orders\views.py", line 59, in checkout
order = Order.objects.create(user=user, customer_name=name, customer_phone=phone, status_id=1)
File "C:\Users\Nikita Shuliak\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django-2.1rc1-py3.7.egg\django\db\utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "C:\Users\Nikita Shuliak\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django-2.1rc1-py3.7.egg\django\db\backends\base\base.py", line 239, in _commit
return self.connection.commit()
django.db.utils.IntegrityError: FOREIGN KEY constraint failed
狀態模型編輯
也許問題就在這里。 在我添加了一些您可以在評論中看到的代碼后,問題出現了。 “最后一個錯誤表明 pk=1 的狀態已經存在,但您之前的錯誤表明相反。請將您的狀態模型添加到您的問題中;讓我們看看是否還有其他條件需要考慮。”:
class Status(models.Model):
name = models.CharField(max_length = 16, blank=True, null=True, default=None)
is_active = models.BooleanField(default=True)
created = models.DateTimeField(auto_now_add=True, auto_now=False)
updated = models.DateTimeField(auto_now_add=False, auto_now=True)
def __str__(self):
return "Статус %s" % self.name
錯誤在一行中:
order = Order.objects.create(user=user, customer_name=name, customer_phone=phone, status_id=1)
您必須為字段
status
傳遞一個狀態實例,因為它是一個
ForeignKey
字段。
僅將
我糾正了,它可以工作; 看到這個帖子。status_id
設置為整數是行不通的。
您的錯誤可能是因為user
(或user_id
)或status
(或status_id
)正在引用相關數據庫表中不存在的實例。
你確定有pk=1
的狀態嗎? 操作Status.objects.get(pk=1)
成功?
嘗試將models.ForeignKey()
的db_constraint
的命名參數設置為False
(默認為True
),如下所示:
status = models.ForeignKey(Status, on_delete=models.PROTECT,db_constraint=False)
這在某個項目中對我有用,唯一的問題是您將無法確保數據庫的完整性(例如,知道引用的所有 Status 對象是否實際存在),但如果您使用的是遺留代碼,這很有意義。 希望能幫助到你。
我看到您沒有保存實例“訂單”。 ---- order.save()
今天,我收到了和你一樣的錯誤信息。 我意識到我忘記在我的代碼中保存一個實例。 我的代碼與你的代碼不同,但我認為你值得一試
我遇到了這個問題,因為我使用了錯誤的表格。 檢查表單的代碼。 在if form.is_valid():
check 之后,我看不到你在哪里使用它。
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