python - Django Multivaluefield 可选字段

Question

我到处搜索，我能找到的都是几年前的东西和/或不适用的东西。

我正在尝试将 MultiValueField 添加到我的表单中，以便人们可以轻松地输入一到三个输入。应该只需要这些字段中的第一个，但表单验证器仍然需要所有三个字段，除非我将整个事情设为可选(这不应该)。

下面是我的 MultiWidget、MultiValueField 和表单的代码。我已经尝试从字段属性中删除除 required=False 之外的所有内容，但它仍然需要所有这些。当我调用字段而不是在字段 __init__ 中时，我尝试在表单中设置 require_all_fields=False 并且它仍然需要所有这些。

我觉得我读了又读又读，关于如何实现这类事情的信息很少。

class ThreeNumFields(forms.MultiWidget):
    def __init__(self, attrs=None):
        self.widgets = [
            forms.TextInput(),
            forms.TextInput(),
            forms.TextInput()
        ]
        super().__init__(self.widgets, attrs)

    def decompress(self, value):
        if value:
            return value.split(' ')
        return [None, None]


class LocationMultiField(forms.MultiValueField):
    widget = ThreeNumFields()
    validators = [RegexValidator]

    def __init__(self):
        fields = (
            forms.CharField(
                error_messages={'incomplete': 'Please enter at least one valid zip code.'},
                validators=[
                    RegexValidator(r'^[0-9]{5}$', 'Enter a valid US zip code.'),
                ],
                max_length=5,
            ),
            forms.CharField(
                required=False,
                validators=[
                    RegexValidator(r'^[0-9]{5}$', 'Enter a valid US zip code.'),
                ],
                max_length=5,
            ),
            forms.CharField(
                required=False,
                validators=[
                    RegexValidator(r'^[0-9]{5}$', 'Enter a valid US zip code.'),
                ],
                max_length=5,
            )
        )
        super(LocationMultiField, self).__init__(
            fields=fields,
            require_all_fields=False,
        )

    def compress(self, data_list):
        return ' '.join(data_list)


class NewForecastForm(forms.ModelForm):
    class Meta:
        model = ForecastProfile
        exclude = ['userid', 'last_updated']

    nickname = forms.CharField(
        label=_('Forecast Nickname')
    )
    locations = LocationMultiField()
    timezone = forms.ChoiceField(
        label=_('Timezone for your forecast'),
        choices=choices.timezones
    )
    start_time = forms.ChoiceField(
        label=_('Earliest time you want in your forecast'),
        help_text=_('(Time will not be exact to account for timezone conversions and forecast data.)'),
        choices=choices.times
    )
    end_time = forms.ChoiceField(
        label=_('Latest time you want in your forecast'),
        help_text=_('(Time will not be exact to account for timezone conversions and forecast data.)'),
        choices=choices.times
    )
    alerts = forms.MultipleChoiceField(
        choices=choices.alerts,
        widget=forms.CheckboxSelectMultiple()
    )
    days_in_forecast = forms.ChoiceField(
        choices=choices.forecastdays
    )

    def clean(self):
        cleaned_data = super(NewForecastForm, self).clean()
        start = cleaned_data.get("start_time")
        end = cleaned_data.get("end_time")

        if start > end:
            raise forms.ValidationError(
                "Your start time must be before your end time."
            )

Answer 1

我遇到了同样的问题，它看起来像是 Django 的一个错误。有一张未结票，#29205 .

就是说，我确实通过设置 required=False、require_all_fields=False 并显式将 required 添加到小部件属性中，从而使表单在我的情况下正常工作表单的初始化方法。

在您的情况下，这意味着将 self.fields['locations'].widget.widgets[0].attrs['required'] = True 放入 NewForecastForm 的 init 方法中