Firebase.child失败：第一个参数isError：Firebase.child失败：第一个参数是无效路径：“null”
这是电影列表的代码。
用户可以使用图片将电影添加到数据库中。用户可以编辑或删除电影。上传和检索没有问题
当我尝试编辑或删除电影时，会显示错误。
请帮忙。 Firebase，离子，cordova和角度使用。当我尝试编辑或删除一个 请帮助解决问题。 如果有人能解释，也会很高兴 他们的答案也是。谢谢！
modals.ts和home.ts拥有大部分代码。所以我认为错误是 那里。
modals.ts
import { Component } from '@angular/core';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
import { NavController, ViewController, NavParams } from 'ionic-
angular';
import { Image } from '../../providers/image';
import { Preloader } from '../../providers/preloader';
import { Database } from '../../providers/database';
import * as firebase from 'firebase';
@Component({
selector: 'page-modals',
templateUrl: 'modals.html'
})
export class ModalsPage {
public form : any;
public filmImage : any;
public movies : any;
public movieName : any = '';
public movieImage : any = '';
public movieGenres : any = [];
public movieDuration : any = '';
public movieSummary : any = '';
public movieActors : any = [];
public movieYear : any = '';
public movieRating : any = '';
public movieId : string = '';
public isEditable : boolean = false;
constructor(
public navCtrl : NavController,
public params : NavParams,
private _FB : FormBuilder,
private _IMG : Image,
public viewCtrl : ViewController,
private _LOADER : Preloader,
private _DB : Database
)
{
this.form = _FB.group({
'summary' : ['', Validators.minLength(10)],
'year' : ['', Validators.maxLength(4)],
'name' : ['', Validators.required],
'duration' : ['', Validators.required],
'image' : ['', Validators.required],
'rating' : ['', Validators.required],
'genres' : ['', Validators.required],
'actors' : ['', Validators.required]
});
this.movies = firebase.database().ref('films/');
if(params.get('isEdited'))
{
let movie = params.get('movie'),
k;
this.movieName = movie.title;
this.movieDuration = movie.duration;
this.movieSummary = movie.summary;
this.movieRating = movie.rating;
this.movieYear = movie.year;
this.movieImage = movie.image;
this.filmImage = movie.image;
this.movieId = movie.id;
for(k in movie.genres)
{
this.movieGenres.push(movie.genres[k].name);
}
for(k in movie.actors)
{
this.movieActors.push(movie.actors[k].name);
}
this.isEditable = true;
}
}
saveMovie(val)
{
this._LOADER.displayPreloader();
let title : string = this.form.controls["name"].value,
summary : string = this.form.controls["summary"].value,
rating : number = this.form.controls["rating"].value,
genres : any = this.form.controls["genres"].value,
actors : any = this.form.controls["actors"].value,
duration : string = this.form.controls["duration"].value,
year : string = this.form.controls["year"].value,
image : string = this.filmImage,
types : any = [],
people : any = [],
k : any;
for(k in genres)
{
types.push({
"name" : genres[k]
});
}
for(k in actors)
{
people.push({
"name" : actors[k]
});
}
if(this.isEditable)
{
if(image !== this.movieImage)
{
this._DB.uploadImage(image)
.then((snapshot : any) =>
{
let uploadedImage : any = snapshot.downloadURL;
this._DB.updateDatabase(this.movieId,
{
title : title,
summary : summary,
rating : rating,
duration : duration,
image : uploadedImage,
genres : types,
actors : people,
year : year
})
.then((data) =>
{
this._LOADER.hidePreloader();
});
});
}
else
{
this._DB.updateDatabase(this.movieId,
{
title : title,
summary : summary,
rating : rating,
duration : duration,
genres : types,
actors : people,
year : year
})
.then((data) =>
{
this._LOADER.hidePreloader();
});
}
}
else
{
this._DB.uploadImage(image)
.then((snapshot : any) =>
{
let uploadedImage : any = snapshot.downloadURL;
this._DB.addToDatabase({
title : title,
image : uploadedImage,
summary : summary,
rating : rating,
duration : duration,
genres : types,
actors : people,
year : year
})
.then((data) =>
{
this._LOADER.hidePreloader();
});
});
}
this.closeModal(true);
}
closeModal(val = null)
{
this.viewCtrl.dismiss(val);
}
selectImage()
{
this._IMG.selectImage()
.then((data) =>
{
this.filmImage = data;
});
}
}
那是modals.ts，还有modals.html
home.ts
import { Component } from '@angular/core';
import { NavController, Platform, ModalController } from 'ionic-angular';
import { ModalsPage } from '../../pages/modals/modals';
import { Image } from '../../providers/image';
import { Preloader } from '../../providers/preloader';
import { Database } from '../../providers/database';
import * as firebase from 'firebase';
import { Http } from '@angular/http';
import 'rxjs/Rx';
@Component({
selector: 'page-home',
templateUrl: 'home.html'
})
export class HomePage {
private auth : any;
public movies : any;
private email : string = 'che@gmail.com';
private pass : string = 'che123';
constructor( public navCtrl : NavController,
private platform : Platform,
private modalCtrl : ModalController,
private _IMG : Image,
private _LOADER : Preloader,
private _DB : Database)
{
}
ionViewDidEnter()
{
this._LOADER.displayPreloader();
this.platform.ready()
.then(() =>
{
firebase.auth().signInWithEmailAndPassword(this.email, this.pass)
.then((credentials) =>
{
this.loadAndParseMovies();
})
.catch((err : Error) =>
{
console.log(err.message);
});
});
}
loadAndParseMovies()
{
this.movies = this._DB.renderMovies();
this._LOADER.hidePreloader();
}
addRecord()
{
let modal = this.modalCtrl.create(ModalsPage);
modal.onDidDismiss((data) =>
{
if(data)
{
this._LOADER.displayPreloader();
this.loadAndParseMovies();
}
});
modal.present();
}
editMovie(movie)
{
let params = { movie: movie, isEdited: true },
modal = this.modalCtrl.create(ModalsPage, params);
modal.onDidDismiss((data) =>
{
if(data)
{
this._LOADER.displayPreloader();
this.loadAndParseMovies();
}
});
modal.present();
}
deleteMovie(movie)
{
this._LOADER.displayPreloader();
this._DB.deleteMovie(movie.id)
.then((data) =>
{
this.loadAndParseMovies();
});
}
}
MydatabaseStructure
Home.html中
<ion-header>
<ion-navbar>
<ion-title>
Moveez
</ion-title>
<ion-buttons end>
<button
ion-button
icon-only
(click)="addRecord()">
<ion-icon name="add"></ion-icon>
</button>
</ion-buttons>
</ion-navbar>
</ion-header>
<ion-content padding>
<ion-refresher (ionRefresh)="doRefresh($event)">
<ion-refresher-content></ion-refresher-content>
</ion-refresher>
<ion-list>
<ion-card
class="movie"
text-wrap
*ngFor="let movie of movies | async">
<ion-item>
<div *ngIf="movie.image">
<img [src]="movie.image">
</div>
<h2>{{ movie.title }}</h2>
<small>{{ movie.date }} ({{ movie.duration }})</small>
<p>{{ movie.summary }}</p>
<section class="multiples">
<h3>Actors/Actresses</h3>
<ion-chip
*ngFor="let actor of movie.actors"
padding-left
padding-right
margin-right>{{ actor.name }}</ion-chip>
</section>
<section class="multiples">
<h3>Genres</h3>
<ion-chip
*ngFor="let genre of movie.genres"
padding-left
padding-right
margin-right>{{ genre.name }}</ion-chip>
</section>
</ion-item>
<div class="manage-record" padding>
<button
ion-button
text-center
color="primary"
(click)="editMovie(movie)">Edit</button>
<button
ion-button
text-center
color="danger"
(click)="deleteMovie(movie)">Delete</button>
</div>
</ion-card>
</ion-list>
</ion-content>
**modals.html**
<ion-header>
<ion-toolbar>
<ion-title>
{{ title }}
</ion-title>
<ion-buttons start>
<button
ion-button
(click)="closeModal()">
<span
ion-text
color="primary"
showWhen="ios">Cancel</span>
<ion-icon
name="md-close"
showWhen="android,windows"></ion-icon>
</button>
</ion-buttons>
</ion-toolbar>
</ion-header>
<ion-content>
<form
[formGroup]="form"
(ngSubmit)="saveMovie(form.value)">
<ion-item-divider color="light">
<div *ngIf="!isEditable">
Add a new movie
</div>
<div *ngIf="isEditable">
Amend this movie
</div>
</ion-item-divider>
<ion-item>
<ion-label stacked>Movie name:</ion-label>
<ion-input
type="text"
formControlName="name"
[(ngModel)]="movieName"></ion-input>
</ion-item>
<ion-item>
<span
ion-text
color="danger"
block
text-center
padding-top
padding-bottom
(click)="selectImage()">Select an image</span>
<input
type="hidden"
name="image"
formControlName="image"
[(ngModel)]="filmImage">
<img [src]="filmImage">
</ion-item>
<ion-item>
<ion-label stacked>Movie length:</ion-label>
<ion-input
type="text"
formControlName="duration"
[(ngModel)]="movieDuration"></ion-input>
</ion-item>
<ion-item>
<ion-label stacked>Genre:</ion-label>
<ion-select
formControlName="genres"
multiple="true"
[(ngModel)]="movieGenres">
<ion-option value="Action">Action</ion-option>
<ion-option value="Comedy">Comedy</ion-option>
<ion-option value="Documentary">Documentary</ion-option>
<ion-option value="Historical">Historical</ion-option>
<ion-option value="Romance">Romance</ion-option>
<ion-option value="Science Fiction">Science Fiction</ion-option>
<ion-option value="Thriller">Thriller</ion-option>
<ion-option value="Zombie">Zombie</ion-option>
<ion-option value="War">War</ion-option>
</ion-select>
</ion-item>
<ion-item>
<ion-label stacked>Actors/actresses:</ion-label>
<ion-select
formControlName="actors"
multiple="true"
[(ngModel)]="movieActors">
<ion-option value="Keanu Reeves">Keanu Reeves</ion-option>
<ion-option value="Ian McShane">Ian McShane</ion-option>
<ion-option value="Adrianne Palicki">Adrianne Palicki</ion-option>
<ion-option value="Woody Harrelson">Woody Harrelson</ion-option>
<ion-option value="Willem Dafoe">Willem Dafoe</ion-option>
<ion-option value="John Leguizamo">John Leguizamo</ion-option>
<ion-option value="Michael Nyqvist">Michael Nyqvist</ion-option>
<ion-option value="Bridget Moynahan">Bridget Moynahan</ion-option>
<ion-option value="Alfie Allen">Alfie Allen</ion-option>
<ion-option value="Russell Crowe">Russell Crowe</ion-option>
<ion-option value="Oliver Reed">Oliver Reed</ion-option>
<ion-option value="Joaquin Phoenix">Joaquin Phoenix</ion-option>
<ion-option value="Connie Nielsen">Connie Nielsen</ion-option>
<ion-option value="Ralf Moeller">Ralf Moeller</ion-option>
<ion-option value="Tom Hanks">Tom Hanks</ion-option>
<ion-option value="Leonardo Dicaprio">Leonardo Dicaprio</ion-option>
<ion-option value="Christopher Walken">Christopher Walken</ion-option>
<ion-option value="Mike Myers">Mike Myers</ion-option>
<ion-option value="Heather Graham">Heather Graham</ion-option>
<ion-option value="Verne Troyer">Verne Troyer</ion-option>
<ion-option value="Robert Wagner">Robert Wagner</ion-option>
<ion-option value="Rob Lowe">Rob Lowe</ion-option>
<ion-option value="Mindy Sterling">Mindy Sterling</ion-option>
</ion-select>
</ion-item>
<ion-item>
<ion-label stacked>Summary:</ion-label>
<ion-textarea
rows="6"
formControlName="summary"
[(ngModel)]="movieSummary"></ion-textarea>
</ion-item>
<ion-item>
<ion-label stacked>Film rating:</ion-label>
<ion-select
formControlName="rating"
[(ngModel)]="movieRating">
<ion-option value="PG">PG</ion-option>
<ion-option value="12">12</ion-option>
<ion-option value="12A">12A</ion-option>
<ion-option value="15">15</ion-option>
<ion-option value="18">18</ion-option>
<ion-option value="U">U</ion-option>
<ion-option value="R18">R18</ion-option>
</ion-select>
</ion-item>
<ion-item>
<ion-label stacked>Year released:</ion-label>
<ion-input
type="text"
formControlName="year"
[(ngModel)]="movieYear"></ion-input>
</ion-item>
<ion-item>
<input
type="hidden"
name="movieId">
<button
ion-button
block
color="primary"
text-center
padding-top
padding-bottom
[disabled]="!form.valid">
<div *ngIf="!isEditable">
Add a new movie
</div>
<div *ngIf="isEditable">
Update this movie
</div>
</button>
</ion-item>
</form>
</ion-content>
1 个答案:
答案 0 :(得分：0)
您在saveMovie(val)函数中犯了一个简单错误。在javascript / typescript中使用for..in构造时，您将获得每个值而不是索引。
for(k in genres)
{
types.push({
// "name" : genres[k] change it
"name" : k
});
}
for(k in actors)
{
people.push({
"name" : k
});
}
根据html，它们都将包含一个字符串数组......
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