Question

我有像这样的Grails Domain Class

class ClassRoom {

    Integer Id
    String classRoomName
    Date dateDeleted

    static hasMany = [students: Student]

}

class Student {
     String studentName
     Date dateDeleted
}

假如我从ClassRoom打印classRoom 1的所有学生。 println ClassRoom.findByIdAndDateDeletedIsNull(1).students它将打印所有有dateDeleted的学生。有没有办法过滤掉dateDeleted SET的记录？

Answer 1

以下将返回学生名单

ClassRoom.executeQuery("""
        select s 
          from ClassRoom c
          join c.students s
         where c.id = :id 
           and c.dateDeleted is null
           and s.dateDeleted is null
""", [id: id])

Answer 2

过滤结果：

ClassRoom.findByIdAndDateDeletedIsNull(1).students.findAll{!it.dateDeleted}

通过Grails 3中的WHERE子句筛选出多个结果

2 个答案: