如何使django表单验证动态？

问题描述

我有一个表单需要有一个有效的URL或一个有效的文件进行上传：

I have a form that needs to have either a valid url or a valid file for uploading:

class ResourceUpload(ModelForm):
   ...
   uploadedfile = forms.FileField('file')
   url_address = forms.URLField('url')
   ...

如何覆盖 FileField 和 URLField 验证器，以便Django只会在上述两个字段都无效时引发错误，但除非另有一个无效，否则只有另一个有效？

How can I override the FileField and URLField validators so that Django only raises an error if both of the fields above are invalid but excepts one being invalid so long as the other is valid?

推荐答案

我的解决方案
专业人士：它保留星号的真正需要的字段和默认错误消息

my solution
pros: it keeps the asterisk for the really required field and default error messages

class Form(forms.ModelForm):
    field1 = SelectField
    field2 = ...
    field3 = ...

    def __init__(self, *args, **kwargs):
        super(Form, self).__init__(*args, **kwargs)
        if kwargs['data']:
            if kwargs['data'].get('field1') == '1':
                self.fields['field2'].required = True
                self.fields['field3'].required = False
            elif kwargs['data'].get('field1') == '2':
                self.fields['field2'].required = False
                self.fields['field3'].required = True

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