django - 你如何使 Django 表单验证动态化？

Question

我有一个表单，需要有一个有效的 url 或一个有效的上传文件:

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 仅在上述两个字段都无效时才引发错误，但只要另一个字段有效，则一个无效除外？

Answer 1

我的解决方案
优点:它为真正需要的字段和默认错误消息保留星号

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