NullInjectorError：InjectionToken angularFire2.app.Options没有提供程序！2021 [英] NullInjectorError: No provider for InjectionToken angularfire2.app.options! 2021

问题描述

好的，我刚开始使用角度火力基地，我已经挠头两天了。大多数教程都是针对较旧版本的FireBase

这是我将身份验证服务注入组件时收到的错误

Uncaught (in promise): NullInjectorError: R3InjectorError(AppModule)[LoginService -> AngularFireAuth -> InjectionToken angularfire2.app.options -> InjectionToken angularfire2.app.options -> InjectionToken angularfire2.app.options]: 
  NullInjectorError: No provider for InjectionToken angularfire2.app.options!
NullInjectorError: R3InjectorError(AppModule)[LoginService -> AngularFireAuth -> InjectionToken angularfire2.app.options -> InjectionToken angularfire2.app.options -> InjectionToken angularfire2.app.options]: 
  NullInjectorError: No provider for InjectionToken angularfire2.app.options!

到目前为止，以下链接没有任何帮助

Link1Link2Link3

app.mode.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { HttpClientModule } from '@angular/common/http';

import { LoginService } from 'src/services/login.service';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';

import { LoginComponent } from './components/login/login.component';
import { HomeComponent } from './components/home/home.component';
import { NotFoundComponent } from './components/not-found/not-found.component';

import { environment } from '../environments/environment';

import { initializeApp,provideFirebaseApp } from '@angular/fire/app';
import { provideAuth,getAuth } from '@angular/fire/auth';
import { provideDatabase,getDatabase } from '@angular/fire/database';
import { provideFirestore,getFirestore } from '@angular/fire/firestore';
import { AngularFirestore } from '@angular/fire/compat/firestore';

@NgModule({
  declarations: [
    AppComponent,
    LoginComponent,
    HomeComponent,
    NotFoundComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    HttpClientModule,
    provideFirebaseApp(() => initializeApp(environment.firebase)),
    provideAuth(() => getAuth()),
    provideDatabase(() => getDatabase()),
    provideFirestore(() => getFirestore()),
    FormsModule,
    ReactiveFormsModule
  ],
  providers: [LoginService],
  bootstrap: [AppComponent]
})
export class AppModule { }

login.service.ts

import { Injectable } from '@angular/core';
import { AngularFireAuth } from '@angular/fire/compat/auth';
import { Router } from '@angular/router';
import { AngularFirestore } from '@angular/fire/compat/firestore';


@Injectable({
  providedIn: 'root'
})
export class LoginService {
  userLoggedIn: boolean;  

  constructor(private afAuth: AngularFireAuth, private router : Router,  private afs: AngularFirestore) {
    this.userLoggedIn = false;
  }

  loginUser(email: string, password: string): Promise<any> {
      return this.afAuth.signInWithEmailAndPassword(email,password)
        .then(() => {
            console.log('Auth Service: loginUser: success');
             this.router.navigate(['']);
        })
        .catch(error => {
            console.log('Auth Service: login error...');
            console.log('error code', error.code);
            console.log('error', error);
            if (error.code)
                return { isValid: false, message: error.message };
            else
                return { isValid: false, message : "Login Error"}
        });
  }

}

login.Component.ts

import { Component, OnInit } from '@angular/core';
import { FormControl, FormGroup, Validators } from '@angular/forms';
import { Router } from '@angular/router';
import { LoginService } from 'src/services/login.service';

@Component({
  selector: 'app-login',
  templateUrl: './login.component.html',
  styleUrls: ['./login.component.scss']
})
export class LoginComponent implements OnInit {
  loginFormCtrl: FormGroup;

  constructor(private LoginService: LoginService, private router: Router) {
    this.loginFormCtrl = new FormGroup({
      email: new FormControl('', Validators.required),
      password: new FormControl(null, Validators.required)
    })
  }


  ngOnInit(): void {

  }

  onLogin() {
    if (this.loginFormCtrl.invalid)
      return;

    this.LoginService.loginUser(this.loginFormCtrl.value.email, this.loginFormCtrl.value.password).then((result) => {
      
      if (result == null) {                              
        console.log('logging in...');
        this.router.navigate(['']);             
      }
      else if (result.isValid == false) {
        console.log('login error', result);
      }
    });
  }

}

Package.json

{
  "name": "fire-base",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "watch": "ng build --watch --configuration development",
    "test": "ng test"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "~12.2.0",
    "@angular/common": "~12.2.0",
    "@angular/compiler": "~12.2.0",
    "@angular/core": "~12.2.0",
    "@angular/fire": "^7.1.1",
    "@angular/forms": "~12.2.0",
    "@angular/platform-browser": "~12.2.0",
    "@angular/platform-browser-dynamic": "~12.2.0",
    "@angular/router": "~12.2.0",
    "rxjs": "~6.6.0",
    "tslib": "^2.3.0",
    "zone.js": "~0.11.4",
    "firebase": "^9.1.0",
    "rxfire": "^6.0.0"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~12.2.7",
    "@angular/cli": "~12.2.7",
    "@angular/compiler-cli": "~12.2.0",
    "@types/jasmine": "~3.8.0",
    "@types/node": "^12.11.1",
    "jasmine-core": "~3.8.0",
    "karma": "~6.3.0",
    "karma-chrome-launcher": "~3.1.0",
    "karma-coverage": "~2.0.3",
    "karma-jasmine": "~4.0.0",
    "karma-jasmine-html-reporter": "~1.7.0",
    "typescript": "~4.3.5"
  }
}

推荐答案

看起来AngularFire正在对Firebase新的模块化API进行重大更改，但文档还没有完全跟上。要点是您正在使用新API初始化Firebase应用程序，但尝试通过旧API使用Firebase资源。

关键是查看导入语句。比较新旧应用程序的初始化风格：

import {AngularFireModule} from '@angular/fire/compat';

[...]

imports: [
    AngularFireModule.initializeApp(environment.firebase),
]

与

import {initializeApp, provideFirebaseApp} from '@angular/fire/app';

[...]

imports: [
    provideFirebaseApp( () => initializeApp(environment.firebase)),
]

请注意旧样式初始化是如何在"；Compat"；名称空间下进行的。如果以这种方式初始化应用程序，还必须使用Compat库来访问资源。例如，从AngularFire docs：

import {AngularFirestore, AngularFirestoreDocument} from '@angular/fire/compat/firestore';

[...]

constructor(private afs: AngularFirestore) {
    this.itemDoc = afs.doc<Item>('items/1');
    this.item = this.itemDoc.valueChanges();
  }

然而，这不适用于新风格的应用程序初始化。相反，您必须使用以下内容，改编自Firebase docs：

import {doc, Firestore, getDoc} from '@angular/fire/firestore';

[...]

constructor(private firestore: Firestore) { }

[...]

const docRef = doc(this.firestore, "cities", "SF");
const docSnap = await getDoc(docRef);

这有什么关系？我假定(但不知道)该应用程序的实例未在新旧之间共享。

所以，这个故事的寓意是：

• 互联网上的大部分文档都使用旧的API。如果要使用该API，请使用库版本。
• 如果要使用现代的模块化API，请确保不是使用"；compat"；库。最好的办法是参考Firebase文档，直到AngularFire团队有机会迎头赶上。

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