Django根据另一个字段表单更新表单

Question

我有以下 Django 表单：

label = forms.CharField(label="Label",
                        min_length=2,
                        max_length=100,
                        required=True,
                        widget=forms.TextInput(attrs={'class': 'form-control input-sm'}))

hour = forms.ChoiceField(label="Hour",
                         choices=choice_hour,
                         required=True,
                         widget=forms.Select(attrs={'class': 'form-control input-sm'}))

minute = forms.ChoiceField(label="Minute",
                           choices=choice_minute,
                           required=True,
                           widget=forms.Select(attrs={'class': 'form-control input-sm'}))

period = forms.MultipleChoiceField(label="Day of week",
                                   choices=choice_period,
                                   required=True,
                                   error_messages={'required': 'At least you must select one day'},
                                widget=forms.CheckboxSelectMultiple(renderer=HorizontalCheckboxRenderer))


snooze = forms.ChoiceField(label="Auto stop",
                           choices=choice_snooze,
                           required=True,
                           widget=forms.Select(attrs={'class': 'form-control input-sm'}))


mode = forms.ChoiceField(label="Mode",
                          choices=choice_mode,
                          required=True,
                          widget=forms.Select(attrs={'class': 'form-control input-sm'}))

if mode == 'music':
        webradio = forms.ModelChoiceField(queryset=Webradio.objects.all(),
                                      widget=forms.Select(attrs={'class': 'form-control input-sm'}), required=False)
    else:
        webradio = forms.ModelChoiceField(queryset=Webradio.objects.all(),
                                  widget=forms.Select(attrs={'class': 'form-control input-sm'}), required=True)

    class Meta:
        model = Alarmclock
        fields = ['label', 'hour', 'minute', 'period', 'snooze', 'mode', 'webradio']

'Mode' 字段表单允许知道用户是否需要 'Radio' 或 'Music'。

当Mode为'music'时，webradio字段可以为空。但是当 Mode 为 'radio' 时，必须设置 webradio 字段。

如何根据模式更新网络广播字段表单？

我尝试了 IF 条件，但我认为没有找到模式变量，webradio 字段一直是必需的。

谢谢。

Answer 1

我想这应该可以解决问题。

class FormName(forms.ModelForm):

    label = forms.CharField(label="Label",
                            min_length=2,
                            max_length=100,
                            required=True,
                            widget=forms.TextInput(attrs={'class': 'form-control input-sm'}))

    hour = forms.ChoiceField(label="Hour",
                             choices=choice_hour,
                             required=True,
                             widget=forms.Select(attrs={'class': 'form-control input-sm'}))

    minute = forms.ChoiceField(label="Minute",
                               choices=choice_minute,
                               required=True,
                               widget=forms.Select(attrs={'class': 'form-control input-sm'}))

    period = forms.MultipleChoiceField(label="Day of week",
                                       choices=choice_period,
                                       required=True,
                                       error_messages={'required': 'At least you must select one day'},
                                    widget=forms.CheckboxSelectMultiple(renderer=HorizontalCheckboxRenderer))


    snooze = forms.ChoiceField(label="Auto stop",
                               choices=choice_snooze,
                               required=True,
                               widget=forms.Select(attrs={'class': 'form-control input-sm'}))


    mode = forms.ChoiceField(label="Mode",
                              choices=choice_mode,
                              required=True,
                              widget=forms.Select(attrs={'class': 'form-control input-sm'}))

    webradio = forms.ModelChoiceField(queryset=Webradio.objects.all(),
                                      widget=forms.Select(attrs={'class': 'form-control input-sm'}), required=True)

    class Meta:
        model = Alarmclock
        fields = ['label', 'hour', 'minute', 'period', 'snooze', 'mode', 'webradio']

    def clean_mode(self):
        mode = self.cleaned_data.get('mode')
        if mode == 'music':
            self.fields['webradio'].required = False
        return super(FormName,self).clean_mode()

它所做的基本上是根据模式的值随时更改 webradio 字段的必需属性。

Answer 2

将webradio字段定义为不需要，然后在clean方法中进行验证（clean的目的是对相互依赖的字段进行验证）。

class Form(forms.ModelForm):

    # other fields ...

    mode = forms.ChoiceField(
        label="Mode", choices=choice_mode, required=True,
        widget=forms.Select(attrs={'class': 'form-control input-sm'})
    )
    webradio = forms.ModelChoiceField(
        queryset=Webradio.objects.all(),
        widget=forms.Select(attrs={'class': 'form-control input-sm'}),
        required=False
    )

    class Meta:
        model = Alarmclock
        fields = ['label', 'hour', 'minute', 'period', 'snooze', 'mode', 'webradio']

    def clean(self):
        mode = self.cleaned_data.get('mode')
        if mode == 'music':
            webradio = self.cleaned_data.get('webradio')
            if not webradio:
                raise forms.ValidationError({'webradio': 'Webradio field is required.'})

查看 the docs 了解更多详情。

请注意，此方法在 Django 1.7 中已更改：

In previous versions of Django, form.clean() was required to return a dictionary of cleaned_data. This method may still return a dictionary of data to be used, but it’s no longer required.

Django根据另一个字段表单更新表单

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