Golang将map数组按照指定字段排序

//获取用户获取的优惠券列表
func GetCouponList(c *gin.Context) {
    defer func() {
        if r := recover(); r != nil {
            util.LogStack(r.(error))
            c.JSON(RequestSuccess, gin.H{"status": SysError, "data": r, "err_msg": "服务器内部错误"})
            return
        }
    }()

    var (
        loginToken         string
        luck_draw_res   []int
        getErr            error
        user_id         int
        params             map[string]string
    )

    coupon_list := make([]map[string]interface{}, 0)
    if luck_draw_res != nil {
        for _, val := range luck_draw_res {
            item := coupon_map[val]
            item["id"] = strconv.Itoa(val)
            title := item["title"]
            item["quota"] = substr(title)
            coupon_list = append(coupon_list, item)
        }
               fmt.Println(coupon_list) //
//[map[desc:15w元以上可用 id:53 quota:5888 title:5888元] map[desc:20w以上可用 id:52 quota:7888 title:7888元]]
        Sort("quota", coupon_list)  //排序,第一个参数是指定的key
    }

    c.JSON(http.StatusOK, gin.H{"status": StatusSuccess, "data": coupon_list, "msg": "Success"}); return
}

//截取字符串
func substr(title interface{}) int {
    title_pro := title.(string)

    rs := []rune(title_pro)
    str := string(rs[0:len(rs)-1])
    val,_ := strconv.Atoi(str)
    return val  //这里截取后
}




//排序  start
type MapsSort struct {
    Key     string
    MapList []map[string]interface{}
}

func (m *MapsSort) Len() int {
    return len(m.MapList)
}

func (m *MapsSort) Less(i, j int) bool {
    return m.MapList[i][m.Key].(int) > m.MapList[j][m.Key].(int)
}

func (m *MapsSort) Swap(i, j int) {
    m.MapList[i], m.MapList[j] = m.MapList[j], m.MapList[i]
}

func Sort(key string, maps []map[string]interface{}) []map[string]interface{} {
    mapsSort := MapsSort{}
    mapsSort.Key = key
    mapsSort.MapList = maps
    sort.Sort(&mapsSort)

    return mapsSort.MapList
}

//排序 end