[Django]-Require that some fields can't left all blank. at least one is required

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You can’t enforce it on the database level, but you can do this in model validation:

def clean(self):
    if not self.file1 and not self.file2 and not self.file3:
        error_msg = 'At least one of these fields must not be empty'
        raise ValidationError({
            'file1': error_msg,
            'file2': error_msg,
            'file3': error_msg,
        })
👤Lorenzo Peña

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