如何在Angular中将日期保存为Firestore的时间戳? [英] How to save date in Angular as a timestamp to Firestore?

问题描述

我正在尝试将具有 出生日期和激活日期 的人的个人信息保存到Angular的Firestore数据库中；

I am trying to save personal info of person with birth date and activation date into Firestore database in Angular;

但是，传递具有Date()类型字段的对象时，日期将保存为字符串:

However, passing object with Date() type fields the dates are saved as a string:

this.treatment.activationDate = new Date();
// gives such result in firestore with string type
// activationDate: "2018-11-16T09:48:51.137Z"

也尝试使用服务器时间戳，但是以下方法未返回有效值:

Also tried to use server timestamp, but the following method does not return valid value:

firebase.firestore.FieldValue.serverTimestamp()

在Firestore中出现结果(抱歉，不允许上传图像:)):

Result in Firestore (not allowed to upload images sorry :) ):

activationDate: (map)
     _methodName: FieldValue.serverTimestamp 

但是，此方法无法为我提供自定义日期的时间戳(例如，birthDate) 那么使用角度将日期保存为Firestore中的时间戳对象的最佳方法是什么?

However, this method can not provide me a timestamp for custom dates (birthDate for example) So what is the best way to save date as a timestamp object in firestore using angular?

.....
import  * as firebase from 'firebase';
.....
export class AddPatientComponent implements OnInit { 
......

this.treatment.activationDate = new Date();
  //firebase.firestore.FieldValue.serverTimestamp();
  console.log("timestamp: ", this.treatment.activationDate,                  firebase.firestore.FieldValue.serverTimestamp()); 
  this.patientService.savePatient(this.patient, this.treatment,   this.courseMeds);

和模型:

export class CourseMed{
  amountPerDay: number;
  atc: String;
  name: String;
  days: number;
  dosage: number;
  form: String;
  method: String;
  periodicity: number;
  takeTimes: string[];
  used: number;
  takenCount: {};

角度6 节点数:8 rxjs 6.3.3 打字稿2.9.2

angular 6 Node: 8 rxjs 6.3.3 typescript 2.9.2

推荐答案

如果要在Cloud Firestore数据库中使用以下日期值:

If you want in your Cloud Firestore database the date value of:

firebase.firestore.FieldValue.serverTimestamp()

您应该使用对 .toDate()<的调用/a>函数.请从官方文档中检出 FireStore时间戳以获得更多信息. .在您的特定情况下，您应该使用以下调用:

You should use a call to .toDate() function. Please checkout FireStore Timestamp from the official documentation for more information. In your particular case, you should use the following call:

treatment.activationDate.toDate()

此更改已添加到 Firebase JS SDK v4.13.0 ，其中JavaScript Date对象应保存为Timestamp类型.

This change was added in Firebase JS SDK v4.13.0, where JavaScript Date objects should be saved of type Timestamp.

这篇关于如何在Angular中将日期保存为Firestore的时间戳?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！