rest_framework.py 文件源码

def _generate_conditions(self,
                             filters: Generator[Tuple[str, RawSQLFilter], None, None]) -> Generator[str, None, None]:
        """
        Returns generator, yields raw-sql conditions strings

        E.g. 'field_name >= %s`

        :param filters: Generator with filter's name and `RawSQLFilter` instance
        """
        for name, filter_ in filters:
            conds_and_values = self._request_filters.get(name)
            if conds_and_values:
                for condition, value in conds_and_values:
                    try:
                        sql = filter_.filter(name, condition, value)
                    except ValidationError as e:
                        raise ValidationError('Exception raised for {}: {}'.format(name, e))
                    yield sql
            elif filter_.default is not None:
                self.params = filter_.default
                yield "{} = %s".format(name)