NOT NULL 约束 failed:orders_order.user_id

Question

我是 django 的新手，我正在建立一个电子商务网站。当我尝试在我的网站上下新订单时出现此错误： NOT NULL 约束 failed:orders_order.user_id

每个用户可以有多个订单，我想在用户个人资料中显示订单，但我在下订单时遇到问题

models.py

class Order(models.Model):
user = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
address = models.CharField(max_length=250)
postal_code = models.CharField(max_length=11)
city = models.CharField(max_length=100)
created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
paid = models.BooleanField(default=False)

class Meta:
    ordering = ('-created',)

def __str__(self):
    return f'Order {self.id}'

def get_total_cost(self):
    return sum(item.get_cost() for item in self.items.all())


class OrderItem(models.Model):
order = models.ForeignKey(Order, related_name='items', on_delete=models.CASCADE)

product = models.ForeignKey(Product, related_name='order_items', on_delete=models.CASCADE)

price = models.DecimalField(max_digits=10, decimal_places=2)
quantity = models.PositiveIntegerField(default=1)

def __str__(self):
    return str(self.id)

def get_cost(self):
    return self.price * self.quantity

forms.py

class OrderCreateForm(forms.ModelForm):
class Meta:
    model = Order
    fields = ['address', 'postal_code', 'city']

views.py

def order_create(request):
cart = Cart(request)
if request.method == 'POST':
    user = request.user
    form = OrderCreateForm(request.POST)
    if form.is_valid():
        order = form.save()
        for item in cart:
            OrderItem.objects.create(order=order, product=item['product'], price=item['price'],
                                     quantity=item['quantity'])
        context = {
            'order': order,
        }
        # clear the cart
        cart.clear()
        return render(request, 'order/created.html', context)
else:
    form = OrderCreateForm()
context = {'cart': cart,
           'form': form,
           }
return render(request, 'order/create.html', context)

模板

{% extends 'shared/_MainLayout.html' %}

{% block content %}
<h1>Checkout</h1>

<div class="order-info">
    <h3>Your order</h3>
    <ul>
        {% for item in cart %}
            <li>
                {{ item.quantity }}x {{ item.product.name }}
                <span>${{ item.total_price }}</span>
            </li>
        {% endfor %}
    </ul>
    <p>Total: ${{ cart.get_total_price }}</p>
</div>

<form method="post" class="order-form">
    {{ form.as_p }}
    <p><input type="submit" value="Place order"></p>
    {% csrf_token %}
</form>
{% endblock %}

Answer 1

OrderCreateForm 用于创建订单，但您没有指定用户字段，因此您应该在将用户对象保存到 views.py 之前将其添加到 Order 当您调用 form.save() 时，它会尝试创建 Order 对象，但该订单没有用户，这就是您获得 NOT NULL 约束的原因 failed:orders_order.user_id

Answer 2

问题已解决：在 views.py 中应该是这样的：

order = form.save(commit=False)
order.user = request.user
order.save()

NOT NULL 约束 failed:orders_order.user_id

NOT NULL constraint failed:orders_order.user_id

python

django

web

django-models

django-views