relations.py 文件源码

def from_native(self, value):
        # Convert URL -> model instance pk
        # TODO: Use values_list
        queryset = self.queryset
        if queryset is None:
            raise Exception('Writable related fields must include a `queryset` argument')

        try:
            http_prefix = value.startswith(('http:', 'https:'))
        except AttributeError:
            msg = self.error_messages['incorrect_type']
            raise ValidationError(msg % type(value).__name__)

        if http_prefix:
            # If needed convert absolute URLs to relative path
            value = urlparse.urlparse(value).path
            prefix = get_script_prefix()
            if value.startswith(prefix):
                value = '/' + value[len(prefix):]

        try:
            match = resolve(value)
        except Exception:
            raise ValidationError(self.error_messages['no_match'])

        if match.view_name != self.view_name:
            raise ValidationError(self.error_messages['incorrect_match'])

        try:
            return self.get_object(queryset, match.view_name,
                                   match.args, match.kwargs)
        except (ObjectDoesNotExist, TypeError, ValueError):
            raise ValidationError(self.error_messages['does_not_exist'])