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How to use _add_select_ifnull method in autotest

Best Python code snippet using autotest_python

models.py

Source:models.py

...291        return query_set.extra(select={select_name: select_sql})292    def _add_select_value(self, query_set, alias):293        return self._add_custom_select(query_set, alias,294                                       _quote_name(alias) + '.value')295    def _add_select_ifnull(self, query_set, alias, non_null_value):296        select_sql = "IF(%s.id IS NOT NULL, '%s', NULL)" % (_quote_name(alias),297                                                            non_null_value)298        return self._add_custom_select(query_set, alias, select_sql)299    def _join_test_label_column(self, query_set, label_name, label_id):300        alias = 'test_label_' + label_name301        label_query = TestLabel.objects.filter(name=label_name)302        query_set = Test.objects.join_custom_field(query_set, label_query,303                                                   alias)304        query_set = self._add_select_ifnull(query_set, alias, label_name)305        return query_set306    def _join_test_label_columns(self, query_set, label_names):307        label_id_map = self._get_label_ids_from_names(label_names)308        for label_name in label_names:309            query_set = self._join_test_label_column(query_set, label_name,310                                                     label_id_map[label_name])311        return query_set312    def _join_test_attribute(self, query_set, attribute, alias=None,313                             extra_join_condition=None):314        """315        Join the given TestView QuerySet to TestAttribute.  The resulting query316        has an additional column for the given attribute named317        "attribute_<attribute name>".318        """319        if not alias:320            alias = 'test_attribute_' + attribute321        attribute_query = TestAttribute.objects.filter(attribute=attribute)322        if extra_join_condition:323            attribute_query = attribute_query.extra(324                    where=[extra_join_condition])325        query_set = Test.objects.join_custom_field(query_set, attribute_query,326                                                   alias)327        query_set = self._add_select_value(query_set, alias)328        return query_set329    def _join_machine_label_columns(self, query_set, machine_label_names):330        for label_name in machine_label_names:331            alias = 'machine_label_' + label_name332            condition = "FIND_IN_SET('%s', %s)" % (333                    label_name, _quote_name(alias) + '.value')334            query_set = self._join_test_attribute(335                    query_set, 'host-labels',336                    alias=alias, extra_join_condition=condition)337            query_set = self._add_select_ifnull(query_set, alias, label_name)338        return query_set339    def _join_one_iteration_key(self, query_set, result_key, first_alias=None):340        alias = 'iteration_result_' + result_key341        iteration_query = IterationResult.objects.filter(attribute=result_key)342        if first_alias:343            # after the first join, we need to match up iteration indices,344            # otherwise each join will expand the query by the number of345            # iterations and we'll have extraneous rows346            iteration_query = iteration_query.extra(347                    where=['%s.iteration = %s.iteration'348                           % (_quote_name(alias), _quote_name(first_alias))])349        query_set = Test.objects.join_custom_field(query_set, iteration_query,350                                                   alias, left_join=False)351        # select the iteration value and index for this join...

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