Question

如何在表单中创建第一个或第二个属性？

在此表单中，我希望用户填写text_to_translate或file。我试图为这两个属性创建clean_something，但它似乎无效。它引起了 -

KeyError异常值：'file'

可能是因为调用clean_text_to_translate方法时，file尚未清除。

你知道该怎么办吗？

class NewOrderForm(forms.ModelForm):
    text_to_translate = forms.CharField(widget=forms.Textarea(attrs={'placeholder': 'Specification'}), required=False)
    file = forms.FileField(required=False)
    delivery_date = forms.DateField(label='Deadline', widget=SelectDateWidget(years=[y for y in range(1930, 2050)]))

    class Meta:
        model = Job
        fields = (
            'short_description', 'language_from', 'text_to_translate', 'file', 'notes','style', 'delivery_date',
        )
        widgets = {
            'text_to_translate': forms.Textarea(attrs={'class': 'form-control'}),
            'language_from': forms.Select(attrs={'class': 'dropdown'})
            # 'level':forms.Select(attrs={'class': 'form-control'}),

        }


    def clean_text_to_translate(self):
        if self.cleaned_data['file'] is None:
            return self.cleaned_data['file']
        return ValidationError('You can fill either text to translate or attach a file')

    def clean_file(self):
        if self.cleaned_data['text_to_translate']=='':
            return self.cleaned_data['text_to_translate']
        return ValidationError('You can fill either text to translate or attach a file')

Answer 1

您正在验证两个相互依赖的字段 - documentation中对此进行了描述。文档建议使用表单的clean（）方法进行验证：

我们一次在多个字段上执行验证，因此表单的clean（）方法是执行此操作的好地方。

此时您可以获得在各个字段中存活的所有值。验证 - 请记住，text_to_translate和file可能为空 - 请勿使用方括号表示法访问这些值，而是使用cleaned_data.get()。您的clean（）方法可能如下所示：

    def clean(self):
        cleaned_data = super(NewOrderForm, self).clean()
        file = cleaned_data.get("file")
        text_to_translate = cleaned_data.get("text_to_translate")
        if file and text_to_translate:  # both fields were filled
            raise forms.ValidationError("You must provide either text or file, not both.")
        elif not (file or text_to_translate)  # neither one was filled
            raise forms.ValidationError("You must provide either text or file")

当然，您需要在模板中使用{{ form.non_field_errors }}显示该错误。

在表单中生成x或y属性

1 个答案: