Question

我用过

fAuth.authState.subscribe( user => {
  if (user) { this.userId = user.uid }
});

但是，我现在尝试通过id在userProfile中搜索以获取点值。

getTotalPoints(){
  this.db.list('/userProfile/' + this.userId).valueChanges().subscribe(
    data => {
      console.log(JSON.stringify(data))
      this.pointsValue = data;
    }
  )
}

我收到错误

运行时错误

未捕获（承诺）：错误：Reference.child失败：第一个参数是无效路径=＆＃34; / userProfile / [object Object]＆＃34;。路径必须是非空字符串，并且不能包含＆＃34;。＆＃34;，＆＃34;＃＆＃34;，＆＃34; $＆＃34;，＆＃34; [＆＃34;，或＆＃34;]＆＃34;错误：Reference.child失败：第一个参数是无效路径=＆＃34; / userProfile / [object Object]＆＃34;。路径必须是非空字符串，并且不能包含＆＃34;。＆＃34;，＆＃34;＃＆＃34;，＆＃34; $＆＃34;，＆＃34; [＆＃34;，或＆＃34;]＆＃34;在Object.exports.validatePathString

很抱歉，如果答案很简单，那就很新了。

这里是 DB

整页代码

import { Component, ViewChild } from '@angular/core';
import { IonicPage, NavController, NavParams, LoadingController } from 'ionic-    angular';
import { AngularFireAuth } from 'angularfire2/auth';
import { AngularFireDatabase, AngularFireList } from 'angularfire2/database';
import 'rxjs/add/operator/map';

@IonicPage()
@Component({
  selector: 'page-dashboard',
  templateUrl: 'dashboard.html',
})

export class DashboardPage {

  pointsValue: {}

  userId = {}

  tasks:Array<any> = [];


  constructor(public navCtrl: NavController, public navParams: NavParams, public db: AngularFireDatabase, public afAuth: AngularFireAuth, public loadingCtrl: LoadingController) {


    afAuth.authState.subscribe( user => {
      if (user) { this.userId = user.uid }
    });

    this.getTotalPoints()

     this.tasks = [
      { 
      name: 'Clean bedroom', 
      status: '100' 
      },
      { 
      name: 'Empty dishwasher', 
      status: '100' 
      },
      { 
      name: 'Take dog for a walk', 
      status: '100' 
      },
    ];

  }

  checkUser() {
    console.log(this.userId);
  }

  getTotalPoints(){
    this.db.list('/userProfile/' + this.userId).valueChanges().subscribe(
      data => {
        console.log(JSON.stringify(data))
        this.pointsValue = data;
      }
    )
  }
}

Answer 1

基于错误

第一个参数是无效路径=“/ userProfile / [object Object]”

userId = {} //is an object, where it should be a non-object data type

并在您的代码中

 //You're doing a async method
 afAuth.authState.subscribe( user => {
      if (user) { this.userId = user.uid }
    });
 /*After that you called your method, which caused userId 
 to be an object since you initialized it as an empty object */
 this.getTotalPoints()

为了更好的实现，请这样做

//Set userId as null
userId: any = null

使此函数具有userId

参数

 getTotalPoints(id: any){
    this.db.list('/userProfile/' + id).valueChanges().subscribe(
      data => {
        console.log(JSON.stringify(data))
        this.pointsValue = data;
      }
    )
  }

然后在订阅调用中这样做

afAuth.authState.subscribe( user => {
      if (user) { 
          this.userId = user.uid 
          this.getTotalPoints(this.userId);
       }
    });

Answer 2

如果要获取Firebase对象的数据

，则使用对象而不是列表

getTotalPoints(){
this.db.object('/userProfile/' + this.userId).valueChanges().subscribe(
  data => {
    console.log(JSON.stringify(data))
    this.pointsValue = data;
  }
)

AngularFire2 doc中的更多信息：https://github.com/angular/angularfire2/blob/master/docs/rtdb/objects.md

我有Firebase身份验证ID，如何在数据库列表中使用它？

2 个答案: