beego循环遍历的问题 求解答

o := orm.NewOrm()

// 查询全部记录
var students = make([]*models.IpayUserPay, 0， 1<<5)

type IpayUserPayWithExtra struct{
    *models.IpayUserPay
    Cardno2 interface{}
}

_, qs := o.QueryTable("ipay_user_pay").Filter("Userid",intid).All(&students)

var studentsExtra = make([]*IpayUserPayWithExtra, 0, len(students))

for k := range students {
    studentsExtra = append(studentsExtra, &IpayUserPayWithExtra{
        IpayUserPay: students[k],
        Cardno2: students[k].Cardno[:4],
    })
}

万分感谢，虽然有些还看不懂但是可先用上，以后慢慢理解