Question

我有一个错误 FOREIGN KEY constraint failed 尝试添加ID => 3的项目时。因此，如果我尝试添加ID 1或2的项目，则没有错误

views.py

from Products.models import product

@login_required()
def add_to_cart(request, **kwargs):
    user_profile = get_object_or_404(Profile, user=request.user)
    products = product.objects.filter(id=kwargs.get('item_id', "")).first()
    if products in request.user.profile.ebooks.all():
        messages.info(request, 'You already own this')
        return redirect(request.META.get('HTTP_REFERER','/')) 
    user_order, status = Order.objects.get_or_create(owner=user_profile, is_ordered=False)
    user_order.items.add(order_item)
    if status:
        # generate a reference code
       # user_order.ref_code = generate_order_id()
        user_order.save()

    # show confirmation message and redirect back to the same page
    messages.info(request, "item added to cart")
    return redirect(request.META.get('HTTP_REFERER','/'))

models.py

class OrderItem(models.Model):
    product = models.OneToOneField(product, on_delete=models.SET_NULL, null=True)
    is_ordered = models.BooleanField(default=False)


class Order(models.Model):
    ref_code = models.CharField(max_length=15)
    owner = models.ForeignKey(Profile, on_delete=models.SET_NULL, null=True)
    is_ordered = models.BooleanField(default=False)
    items = models.ManyToManyField(OrderItem)
class product(models.Model):
    category = models.ForeignKey(Category, on_delete=models.PROTECT)

FOREIGN KEY约束失败，并带有特定ID

0 个答案: