Ia正在开发一个应用程序,该应用程序以"yyyy/MM/dd kk:mm:ss"
的格式接收datamessages
和timestamp
。这里是JSON数据格式。通过日期戳记对Firebase数据进行排序
"NOT20170828132901" :
{
"code" : "Your order status has been updated to Rejected",
"date" : "2017/08/28 13:29:01",
"title" : "Order update SPB20170825095233542"
}
我想排序基于最新时间戳NOTNUMBER。我试着用limitToLast(i)
,还有limitToFirst(i)
,但是是静静的。结果是升序。 Iwant将日期戳分类为降序。我也尝试使用startAt(futuredatestamp).endAt(pastdatestamp)
,但不工作。我想在此排序:
"NOT20170828140827" : {
"code" : "Your order status has been updated to Rejected",
"date" : "2017/08/28 14:08:27",
"title" : "Order update SPB20170825095233542"
},
"NOT20170828140436" : {
"code" : "Your order status has been updated to Delivered",
"date" : "2017/08/28 14:04:36",
"title" : "Order update SPB20170825095233542"
},
"NOT20170828132901" : {
"code" : "Your order status has been updated to Rejected",
"date" : "2017/08/28 13:29:01",
"title" : "Order update SPB20170825095233542"
},
"NOT20170828115852" : {
"code" : "Your order status has been updated to Rejected",
"date" : "2017/08/28 11:58:52",
"title" : "Order update SPB20170825095233542"
},
"NOT20170828014147" : {
"code" : "Your order status has been updated to IN TRANSIT",
"date" : "2017-08-28 01:41:47",
"title" : "Order update : SPB20170825095233542"
}
使用过滤器参数时有些困惑。
请帮帮我。在此先感谢
工作得很好。但数据仅以升序排列。我不得不使用@Nyagaka Enock的以下解决方案来反转回收站数据。 –