我正在尝试将从 firestore 文档收集的数据分配给一个在构造函数之前初始化为 Observable 类型的变量。
我通过将动态 invoiceId 字符串传递给 .doc() 搜索来从集合中获取数据,并且我可以将数据分配给局部变量(如下所示),但是在尝试将其分配给此变量时.invoice,我收到以下错误:
Uncaught (in promise): TypeError: Cannot set property 'invoice' of undefined
-
组件:
import { Component, OnInit, Input } from '@angular/core';
import { ActivatedRoute } from '@angular/router';
import { Observable } from 'rxjs/Observable';
import { AngularFireDatabase } from 'angularfire2/database';
import { AngularFirestore, AngularFirestoreCollection, AngularFirestoreDocument } from 'angularfire2/firestore';
import { AuthService } from '../../services/auth.service';
import { Invoice } from '../invoiceModel';
@Component({
selector: 'app-view-invoice',
templateUrl: './view-invoice.component.html',
styleUrls: ['./view-invoice.component.scss']
})
export class ViewInvoiceComponent implements OnInit {
userId: string;
invoiceId: any;
invoicesCollection: AngularFirestoreCollection<Invoice>;
invoices: Observable<Invoice[]>;
invoice: Observable<Invoice>;
constructor(private authService: AuthService, private db: AngularFirestore, private route: ActivatedRoute) {
this.userId = this.authService.user.uid;
this.route.params.subscribe(params => {
this.invoiceId = params.id;
})
this.invoicesCollection = this.db.collection('/invoices');
this.invoices = this.invoicesCollection.snapshotChanges().map(changes => {
return changes.map(a => {
const data = a.payload.doc.data() as Invoice;
data.id = a.payload.doc.id;
return data;
})
})
}
ngOnInit() {
this.getInvoice();
}
getInvoice() {
var docref = this.db.collection('/users').doc(this.authService.user.uid).collection('/invoices').doc(this.invoiceId);
docref.ref.get()
.then(function(doc) {
if (doc.exists) {
var invoice = doc.data(); <------WORKS
// this.invoice = doc.data(); <------DOESN'T WORK
console.log('Invoice data: ', doc.data());
} else {
console.error('No matching invoice found');
}
})
}
}
最佳答案
我也在和同样的事情作斗争。这让我发疯!我是新手,但我似乎已经通过更改一行代码解决了您的问题:
.then(function(doc) { //changed from
.then((doc) => { //changed to (removed the function)
我什至不明白这样做的后果,但范围现在正在努力分配变量的值。
关于Angular Firestore - 获取文档数据并分配给变量,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/49067294/