How to use _extract_special_params method in autotest

Best Python code snippet using autotest_python

model_logic.py

Source:model_logic.py

...649    # see query_objects()650    _SPECIAL_FILTER_KEYS = ('query_start', 'query_limit', 'sort_by',651                            'extra_args', 'extra_where', 'no_distinct')652    @classmethod653    def _extract_special_params(cls, filter_data):654        """655        :return: a tuple of dicts (special_params, regular_filters), where656        special_params contains the parameters we handle specially and657        regular_filters is the remaining data to be handled by Django.658        """659        regular_filters = dict(filter_data)660        special_params = {}661        for key in cls._SPECIAL_FILTER_KEYS:662            if key in regular_filters:663                special_params[key] = regular_filters.pop(key)664        return special_params, regular_filters665    @classmethod666    def apply_presentation(cls, query, filter_data):667        """668        Apply presentation parameters -- sorting and paging -- to the given669        query.670        :return: new query with presentation applied671        """672        special_params, _ = cls._extract_special_params(filter_data)673        sort_by = special_params.get('sort_by', None)674        if sort_by:675            assert isinstance(sort_by, list) or isinstance(sort_by, tuple)676            query = query.extra(order_by=sort_by)677        query_start = special_params.get('query_start', None)678        query_limit = special_params.get('query_limit', None)679        if query_start is not None:680            if query_limit is None:681                raise ValueError('Cannot pass query_start without query_limit')682            # query_limit is passed as a page size683            query_limit += query_start684        return query[query_start:query_limit]685    @classmethod686    def query_objects(cls, filter_data, valid_only=True, initial_query=None,687                      apply_presentation=True):688        """689        Returns a QuerySet object for querying the given model_class690        with the given filter_data.  Optional special arguments in691        filter_data include:692        -query_start: index of first return to return693        -query_limit: maximum number of results to return694        -sort_by: list of fields to sort on.  prefixing a '-' onto a695         field name changes the sort to descending order.696        -extra_args: keyword args to pass to query.extra() (see Django697         DB layer documentation)698        -extra_where: extra WHERE clause to append699        -no_distinct: if True, a DISTINCT will not be added to the SELECT700        """701        special_params, regular_filters = cls._extract_special_params(702            filter_data)703        if initial_query is None:704            if valid_only:705                initial_query = cls.get_valid_manager()706            else:707                initial_query = cls.objects708        query = initial_query.filter(**regular_filters)709        use_distinct = not special_params.get('no_distinct', False)710        if use_distinct:711            query = query.distinct()712        extra_args = special_params.get('extra_args', {})713        extra_where = special_params.get('extra_where', None)714        if extra_where:715            # escape %'s...

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