validation.py 文件源码

def validate_radio_fields(self, cls, model):
        " Validate that radio_fields is a dictionary of choice or foreign key fields. "
        from django.contrib.admin.options import HORIZONTAL, VERTICAL
        if hasattr(cls, 'radio_fields'):
            check_isdict(cls, 'radio_fields', cls.radio_fields)
            for field, val in cls.radio_fields.items():
                f = get_field(cls, model, 'radio_fields', field)
                if not (isinstance(f, models.ForeignKey) or f.choices):
                    raise ImproperlyConfigured("'%s.radio_fields['%s']' "
                            "is neither an instance of ForeignKey nor does "
                            "have choices set." % (cls.__name__, field))
                if val not in (HORIZONTAL, VERTICAL):
                    raise ImproperlyConfigured("'%s.radio_fields['%s']' "
                            "is neither admin.HORIZONTAL nor admin.VERTICAL."
                            % (cls.__name__, field))