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How to use _get_group_query_sql method in autotest

Best Python code snippet using autotest_python

models.py

Source:models.py

...14                field_names.append(field)15            else:16                field_names.append(self._get_key_unless_is_function(field))17        return field_names18    def _get_group_query_sql(self, query, group_by, extra_select_fields):19        group_fields = self._get_field_names(group_by, extra_select_fields)20        select_fields = [field for field in group_fields21                         if field not in extra_select_fields]22        for field_name, field_sql in extra_select_fields.iteritems():23            field_sql = self._get_key_unless_is_function(field_sql)24            select_fields.append(field_sql + ' AS ' + field_name)25            # add the extra fields to the query selects, so they'll be sortable26            # and Django won't mess with any of them27            query._select[field_name] = field_sql28        _, where, params = query._get_sql_clause()29        # insert GROUP BY clause into query30        group_by_clause = ' GROUP BY ' + ', '.join(group_fields)31        group_by_position = where.rfind('ORDER BY')32        if group_by_position == -1:33            group_by_position = len(where)34        where = (where[:group_by_position] +35                 group_by_clause + ' ' +36                 where[group_by_position:])37        return ('SELECT ' + ', '.join(select_fields) + where), params38    def _get_column_names(self, cursor):39        """\40        Gets the column names from the cursor description. This method exists41        so that it can be mocked in the unit test for sqlite3 compatibility."42        """43        return [column_info[0] for column_info in cursor.description]44    def execute_group_query(self, query, group_by, extra_select_fields=[]):45        """46        Performs the given query grouped by the fields in group_by with the47        given extra select fields added.  extra_select_fields should be a dict48        mapping field alias to field SQL.  Usually, the extra fields will use49        group aggregation functions.  Returns a list of dicts, where each dict50        corresponds to single row and contains a key for each grouped field as51        well as all of the extra select fields.52        """53        sql, params = self._get_group_query_sql(query, group_by,54                                                extra_select_fields)55        cursor = readonly_connection.connection().cursor()56        cursor.execute(sql, params)57        field_names = self._get_column_names(cursor)58        row_dicts = [dict(zip(field_names, row)) for row in cursor.fetchall()]59        return row_dicts60    def get_count_sql(self, query):61        """62        Get the SQL to properly select a per-group count of unique matches for63        a grouped query.  Returns a tuple (field alias, field SQL)64        """65        if query._distinct:66            pk_field = self.get_key_on_this_table()67            count_sql = 'COUNT(DISTINCT %s)' % pk_field...

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