I am trying to build a simple blog with Angular 2 and Firebase and I am having issues using async pipe in a component. I get the error in the console.
zone.js:344Unhandled Promise rejection: Template parse errors: The pipe 'async' could not be found ("
[ERROR ->]{{ (blog.user | async)?.first_name }}
"): BlogComponent@6:3 ; Zone: ; Task: Promise.then ; Value: Error: Template parse errors:(…) Error: Template parse errors: The pipe 'async' could not be found ("
blog.component.ts
import {Component, Input} from "@angular/core";
@Component({
selector: 'blog-component',
templateUrl: './blog.component.html',
styleUrls: ['./blog.component.css'],
})
export class BlogComponent {
@Input() blog;
}
blog.component.html
<h1 class="article-title">{{ blog.title }}</h1>
<p>{{ (blog.user | async)?.first_name }}</p>
app.component.ts
import { Component } from '@angular/core';
import { BlogService } from "./services/services.module";
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
constructor(private blogService: BlogService) {}
articles = this.blogService.getAllArticles();
}
app.component.html
<article *ngFor="let article of articles | async">
<blog-component [blog]="article"></blog-component>
</article>
blog.service.ts
import {Injectable} from "@angular/core";
import {AngularFire} from "angularfire2";
import {Observable} from "rxjs";
import "rxjs/add/operator/map";
@Injectable()
export class BlogService {
constructor(private af: AngularFire) { }
getAllArticles(): Observable<any[]> {
return this.af.database.list('articles', {
query: {
orderByKey: true,
limitToLast: 10
}
}).map((articles) => {
return articles.map((article) => {
article.user = this.af.database.object(`/users/${article.user_id}`);
return article;
});
});
}
}
The problem arises only when I try to use async in blog.component.html file. It works if I try to print the user name in app.component.html file. Should I be injecting AsyncPipe in blog.module.ts? How can I get the async working in blog.component.ts?
CommonModuleto yourBlogModule'simports– Collegiate