我们如何使用Angular通过TimeStamp数据类型对Firebase Firestore数据进行排序? [英] How can we sort Firebase Firestore data by TimeStamp dataType using Angular?

问题描述

我正在使用票证发布Web应用程序，并且我将仅显示那些有效且具有24小时记录(从现在开始)的票证.

I am having Ticket Posting Web App, and i would show only those tickets which are active and with-in 24 hours records(from now on).

我正在将 Firebase Cloud Firestore 与 Angular 7 结合使用.

 getTicketList(){
 this.ticketData = 
 this.fireStore.collection('ticket').doc("paid").collection("ticket-list", 
 ref =>
 ref.where('status', '==', 
  "active").where("paid","==","false").orderBy("myTimeStamp");
 return this.ticketData.snapshotChanges() ;
 }

我们有一个键"myTimestamp"，它是 Firestore Timestamp 类型.

We are having a a key "myTimestamp" which is Firestore Timestamp Type.

只想显示那些有效且当前还有剩余时间要预定的记录.

want to show only those records which are active and currently having a time remaining to book.

下面我提到了我用来从Firebase服务获取的代码.

Beow i mentioned the codes which i am using to get from Firebase service.

 this.firestore.getTicketList().subscribe(list => {
  this.ticketList = list.map(item => {
    return { id:item.payload.doc.id,
      ...item.payload.doc.data()}
  })
  console.log(this.ticketList);
});

谢谢

已编辑

推荐答案

您可以通过传递 Date 对象来查询数据/时间戳字段.因此，例如，现在就获取所有物品:

You can query on a data/timestamp field by passing a Date object. So for example to get all items before right now:

ref
  .where('status', '==', "active")
  .where("paid","==","false")
  .where("myTimeStamp","<", new Date())
  .orderBy("myTimeStamp")

这篇关于我们如何使用Angular通过TimeStamp数据类型对Firebase Firestore数据进行排序?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！