分页在kaminari rails中的左连接和分组失败

Question

Kaminari宝石因以下分页而无法分页 从控制器，我试图调用以下范围。 @ students.expired

    scope :expired, -> { joins("LEFT JOIN (select MAX(expires_on) AS expires_on, student_id FROM subscriptions GROUP BY student_id) AS current_subscription ON current_subscription.student_id = role_students.id")
           .where{ ((current_subscription.expires_on < Date.today)) | ((trial_ended_on < Date.current) & (current_subscription.expires_on == nil)) } }

它抛出以下错误：

  

Mysql2 :: Error：“ where”中的未知列“ student_schools.school_id”   子句”：选择count（*）作为subquery_count