SQLAlchemy multiple和expression在同一个条目上创建多个选择

Question

我正在尝试根据如下表达式筛选查询：

self.query = self.query.filter(expression)

但是当我过滤它时，查询会添加两次select语句，这在MYSQL中会导致一个操作错误：1060“重复的列名'xxxx'。以下是我的SQLAlchemy表达式：

'"var__490__07McUdXtiy".response IS NOT NULL AND "var__490__07McUdXtiy".response != :param_1 AND "var__490__07McUdXtiy".response = :param_2'

只有在表达式中有多个和时才会发生。为了更清楚地看到重复的select，我已经拆分了字符串。在下面的结果中，它是var\ U 490\ U 07McUdXtiy：

['SELECT auth_user.id AS auth_user_id',
 ' auth_user.password AS auth_user_password',
 ' auth_user.last_login AS auth_user_last_login',
 ' auth_user.is_superuser AS auth_user_is_superuser',
 ' auth_user.username AS auth_user_username',
 ' auth_user.first_name AS auth_user_first_name',
 ' auth_user.last_name AS auth_user_last_name',
 ' auth_user.email AS auth_user_email',
 ' auth_user.is_staff AS auth_user_is_staff',
 ' auth_user.is_active AS auth_user_is_active',
 ' auth_user.date_joined AS auth_user_date_joined',
 ' `var__490__07McUdXtiy`.response AS `07McUdXtiy_short`',
 ' `var__490__07McUdXtiy`.response AS `07McUdXtiy_short` \nFROM auth_user INNER JOIN reviewroom_reviewroomgroup_members ON reviewroom_reviewroomgroup_members.user_id = auth_user.id AND reviewroom_reviewroomgroup_members.reviewroomgroup_id IN (%s',
 ' %s) LEFT OUTER JOIN surveys_responsegroup AS survey__490 ON survey__490.user_id = auth_user.id AND survey__490.deleted = %s AND survey__490.survey_id = %s LEFT OUTER JOIN surveys_response AS `var__490__07McUdXtiy` ON `var__490__07McUdXtiy`.group_id = survey__490.id AND `var__490__07McUdXtiy`.question = %s \nWHERE `var__490__07McUdXtiy`.response IS NOT NULL AND `var__490__07McUdXtiy`.response != %s AND `var__490__07McUdXtiy`.response = %s']

任何帮助都将不胜感激，谢谢

Answer 1

我想出来了。BinaryExpression实际上有两个expression子句，因此第二个子句创建了另一个select