models.py 文件源码

def clean(self):
        # ensure talk and workshop are NOT filled at the same time
        if self.talk and self.workshop:
            message = _('Please, select either a Talk or a Workshop, not both.')
            raise ValidationError({
                'talk': ValidationError(message=message, code='invalid'),
                'workshop': ValidationError(message=message, code='invalid'),
            })