filters.py 文件源码

def to_python(self, value):
        if value in self.empty_values:
            return None

        try:
            obj = json.loads(value)
        except JSONDecodeError:
            raise DjangoValidationError(self.default_error_messages['invalid_json'], code='invalid_json')

        if set(obj) != {'max_distance', 'coordinates'}:
            raise DjangoValidationError(self.default_error_messages['invalid_fields'], code='invalid_fields')

        max_distance = obj['max_distance']
        coordinates = obj['coordinates']

        try:
            max_distance = float(max_distance)
        except ValueError:
            raise DjangoValidationError(self.default_error_messages['invalid_max_distance'], code='invalid_max_distance')


        if not check_coordinates(coordinates):
            raise DjangoValidationError(self.default_error_messages['invalid_coordinates'], code='invalid_coordinates')

        return Point(*coordinates), Distance(m=max_distance)