Django ModelForm 自定义日期字段

Question

我正在尝试创建一个预订表单，该表单在 posted 时为模型预订创建一个对象。我正在使用自定义日期选择器小部件来选择食物，但我也在使用 ModelForms。

问题是，如果我没有在 forms.py 的元字段列表中列出 'date'，则表单不会查找 [=] 上的日期字段表单输入37=]。但是，如果我在 forms.py 模型的元字段中包含 'date'，那么它会出错并显示 "date field can not be left blank"，即使它不是空白...

forms.py

class ReservationForm(forms.ModelForm):

    date = forms.DateField(
        widget=DatePickerInput(format='%m/%d/%Y')
        )
    def clean_date(self):
        data = self.cleaned_data['date']

        # Check if a date is not in the past.
        if data < datetime.date.today():
            raise ValidationError(_('Invalid date - reservation in past'), code='invalid')
            messages.danger(request, "Reservation Created")
            print('ERROR')


            # Remember to always return the cleaned date.
            return data

    class Meta:
        model = Reservation
        fields = ('reservation_time', 'people', 'name', 'email', 'phone') # REMOVED 'date'

views.py

def reservationFormView(request):
    #reservation = create(Reservation)
        # If this is a POST request then process the Form data
    if request.method == 'POST':
        # Create a form instance and populate it with data from the request (binding):
        form = ReservationForm(request.POST)

        # Check if the form is valid:
        if form.is_valid():
            # process the data in form.cleaned_data as required

            reservation = form.save(commit=False)
            reservation.ReservationEmail = form.cleaned_data['email']
            reservation.ReservationName = form.cleaned_data['name']
            reservation.ReservationPeople = form.cleaned_data['people']
            reservation.ReservationTime = form.cleaned_data['reservation_time']
            reservation.date = form.cleaned_data['date']
            print( reservation.date)
            #reservation.created_time = timezone.now()
            reservation.save()

                # redirect to a new URL:
            return HttpResponseRedirect('/reservation-confirmation/')

        # If this is a GET (or any other method) create the default form.
    else:
        form = ReservationForm()

    return render(request, 'home/reservation_form.html', {'form': form, })

models.py

class Reservation(BaseModel):
    class Meta:
        verbose_name_plural = "Reservations"

    TIME_CHOICES = (
...
    )
    SEATING_CHOICES = (
...
    )
    date = models.DateField(null=True)
    name = models.CharField(max_length=35, null=True)
    phone = PhoneNumberField(null=True)   #USE THIS https://github.com/stefanfoulis/django-phonenumber-field
    email = models.EmailField(null=True)
    people = models.PositiveSmallIntegerField(choices=SEATING_CHOICES, default=None, db_index=True)
    reservation_time = models.PositiveSmallIntegerField(choices=TIME_CHOICES, default=None, db_index=True)

    def __str__(self):
        return '(%s) %s %s' % (self.date, self.name, self.phone )

Answer 1

您的 clean_date 方法 而不是 return 值，以防 if 条件为 False。您应该 return 清理后的数据，以防它是正确的，例如：

def clean_date(self):
    data = self.cleaned_data['date']

    # Check if a date is not in the past.
    if data < datetime.date.today():
        raise ValidationError(_('Invalid date - reservation in past'), code='invalid')
        messages.danger(request, "Reservation Created")

    # <i>not</i> indented under the if
    <b>return data</b>

否则，此函数将 return None 如果数据有效，并引发 ValidationError 如果数据无效。

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