javascript – Firebase：加入表格

post: {
  authorId: '123AA',title: 'first Post',body: 'yay'
}

author: {
  uid: '123AA',displayName: 'Richard'
  email: 'im@richard.com'
}

<div className="post">
  <div className="title">{post.titlE}</div>
  <div className="body">{post.body}</div>
  <div className="author-name">{post.author.displayNamE}</div> //problem
</div>

const postsRef = firebase.database().ref('posts/')
postsRef.on('value',(snapshot) => {
  this.setState({posts: snapshot.val()})
})

在真正的firebase中不确定,但我经常在angular2中使用join.这是我的示例代码.

import { Component,OnInit } from '@angular/core';
import { AngularFire } from 'angularfire2';
import { Observable } from 'rxjs/Observable'; 
import 'rxjs/add/operator/map';

@Component({
  SELEctor: 'app',templateUrl: `
    <ul>
        <li *ngFor="let p of posts | async">
            {{ p.title }} - {{ (p.authorName | asynC)?.displayName }}
        </li>        
    </ul>
`
})
export class InitComponent implements OnInit {
    posts: Observable<anY[]>;

  constructor(private af: AngularFirE) {}

  ngOnInit() {
      this.posts = this.af.database.list('/posts')
      .map(posts => {
          posts.map(p => {
              p.authorName = this.af.database.object('/authors/'+p.authorId);
          });
          return posts;
      });
  }

数据库结构如下：

/posts/postId/{authorId,title,body}
/authors/authorId/{displayName,email}

希望这可以帮助