Django localflavor 字段覆盖中断表单

Question

我有以下表单，在提交时会生成值错误。

/en/orders/create/

处的值错误

视图 orders.views.order_create 没有 return HttpResponse 对象。它 return 改为 None。

我的表格：

from django import forms
from .models import Order
from localflavor.us.forms import USZipCodeField


class OrderCreateForm(forms.ModelForm):
    postal_code = USZipCodeField()

    class Meta:
        model = Order

        fields = ['first_name', 'last_name', 'email', 'address',
                  'postal_code', 'city']

我的模特：

class Order(models.Model):
    first_name = models.CharField(_('first name'), max_length=50)
    last_name = models.CharField(_('last name'), max_length=50)
    email = models.EmailField(_('e-mail'))
    address = models.CharField(_('address'), max_length=250)
    postal_code = models.CharField(_('postal code'), max_length=20)
    city = models.CharField(_('city'), 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}'

我的看法：

def order_create(request):
    if request.method == 'POST':
        form = OrderCreateForm(request.POST)

        if form.is_valid():
            order.save()

            request.session['order_id'] = order.id

            # redirect for payment return
            return redirect(reverse('payment:process'))

    else:
        form = OrderCreateForm()
        return render(request,
                      'orders/order/create.html',
                      {'cart': cart, 'form': form})

回溯：

Environment:


Request Method: POST
Request URL: http://127.0.0.1:8000/en/orders/create/

Django Version: 3.0.6
Python Version: 3.8.2
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'rosetta',
 'parler',
 'localflavor',
 'shop.apps.ShopConfig',
 'cart.apps.CartConfig',
 'orders.apps.OrdersConfig',
 'payment.apps.PaymentConfig',
 'coupons.apps.CouponsConfig']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.locale.LocaleMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware']



Traceback (most recent call last):
  File "/home/[user]/.virtualenvs/shop/lib/python3.8/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/home/[user]/.virtualenvs/shop/lib/python3.8/site-packages/django/core/handlers/base.py", line 124, in _get_response
    raise ValueError(

Exception Type: ValueError at /en/orders/create/
Exception Value: The view orders.views.order_create didn't return an HttpResponse object. It returned None instead.

流程运行良好，并重定向到付款表单，表单中没有此行：postal_code = USZipCodeField()

我似乎无法理解导致错误的原因。

预期行为：

表单有效，重定向到付款。

在无效表单上，USZipCodeField 引发的验证错误："Enter a zip code in the format XXXXX or XXXXX-XXXX."

Answer 1

我认为问题是在表单无效的情况下代码没有呈现表单。对于无效表单，函数 returns None 正是您看到的错误消息。也许您提交的是空值或无效值？试试这个修改过的（未经测试的）版本：

def order_create(request):
    if request.method == 'POST':
        form = OrderCreateForm(request.POST)

        if form.is_valid():
            order = form.save()

            request.session['order_id'] = order.id

            # redirect for payment return
            return redirect(reverse('payment:process'))

    else:
        form = OrderCreateForm()

    # FIXME Where does 'cart' come from?
    return render(request,
                  'orders/order/create.html',
                  {'cart': cart, 'form': form})

这个有用吗？

您可能需要考虑使用内置的 CreateView 来避免样板表单处理代码： https://docs.djangoproject.com/en/3.0/ref/class-based-views/flattened-index/#CreateView

如果您还没有使用过基于 class 的视图，那绝对值得研究。我发现使用它们我可以移动得更快一些，但是它们确实需要一些时间来学习并且当事情不起作用时让流程更难遵循。以下是基于 class 的视图的完整文档： https://docs.djangoproject.com/en/3.0/topics/class-based-views/

Django localflavor 字段覆盖中断表单

Django localflavor field overwrite breaks form

python

django

django-localflavor