Django表单永远无效，因此不会保存到数据库中

Question

我正在创建一个注册模型，其中有日期，时间(带选项的字符)，客户和餐厅。我需要一些帮助，为什么我的实例不保存，即使当我填写我的模型表单

models.py

class reservation(models.Model):
TIMESLOTS = [
('11:00-1:00', '11:00-1:00'),
('01:00-3:00', '01:00-03:00'),
('03:00-05:00', '03:00-05:00'),
('05:00-07:00', '05:00-07:00'),
('07:00-09:00', '07:00-09:00')
]
date=models.DateField(null=True)
time=models.CharField(null=True,max_length=200,choices=TIMESLOTS)
customer=models.OneToOneField(User,null=True,on_delete=models.CASCADE)
restaurant=models.OneToOneField(Restaurantdetails,on_delete=models.CASCADE,null=True)
def __str__(self):
return self.restaurant.name

forms.py

class Reservationform(ModelForm):
class Meta:
model=reservation
fields=['date','time','restaurant']

views.py

def reservationcreator(request):
form=Reservationform()
if form.is_valid():
form = Reservationform(request.POST)
res=form.save()
res.customer=request.user
res.save()
messages.success(request, 'reservation created')
return redirect('menu')
else:
print('BS')
context = {'form': form}
return render(request,'userrestaurant/reservation.html',context)

Answer 1

您的表单将永远无效，因为您提供的是一个空表单。您需要在验证它之前将request.POST数据添加到表单:

def reservationcreator(request):
form=Reservationform(request.POST or None)
if form.is_valid():
res.customer=request.user
res=form.save()
messages.success(request, 'reservation created')
return redirect('menu')
else:
print('BS')
context = {'form': form}
return render(request,'userrestaurant/reservation.html',context)

Answer 2

如果不是有界，则永远不有效。有界表单是接收数据的表单，例如通过request.POST或request.GET;request.FILES。因此，检查HTTP方法，并根据该方法初始化表单，如下所示:

def reservationcreator(request):
if request.method == 'POST':
form = Reservationform(request.POST, request.FILES)
if form.is_valid():
form.instance.customer = request.user
form.save()
messages.success(request, 'reservation created')
return redirect('menu')
else:
form = ReservationForm()
context = {'form': form}
return render(request, 'userrestaurant/reservation.html', context)

话虽如此，你的视图是一个简单的CreateView[Django-doc]，可以通过:

from django.contrib.auth.mixins import LoginRequiredMixin
from django.contrib.messages.views import SuccessMessageMixin
from django.urls import reverse
from django.views.generic import CreateView
class ReservationCreateView(LoginRequiredMixin, SuccessMessageMixin, CreateView):
form_class = ReservationForm
template_name = 'userrestaurant/reservation.html'
success_url = reverse('menu')
success_message = 'reservation created'
def form_valid(self, form):
form.instance.customer = request.user
return super().form_valid(form)

---

注意:通常最好使用settings.AUTH_USER_MODEL^[Django-doc]引用用户模型，而不是使用Usermodel^[Django-doc]要了解更多信息，您可以查看引用User模型文档部分。

---

注意:您可以使用@login_required装饰<一口>[Django-doc]。