NullInjectorError：InjectionToken angularfire2.app.options 没有提供程序

Question

我正在尝试将表单数据插入云 Firestore 数据库。下面是我的 x.component.ts 文件，我在其中编写的构造函数出现错误

private firestore: AngularFireStore

    import { Component, OnInit } from '@angular/core';
    import { GroupService } from '../shared/group.service';
    import { NgForm } from '@angular/forms';
    // import { NullTemplateVisitor } from '@angular/compiler';
    import { AngularFirestore } from '@angular/fire/firestore';
    // import { AngularFireModule } from 'angularfire2';
    // import { AngularFirestoreModule } from 'angularfire2/firestore';
    
    @Component({
      selector: 'app-group',
      templateUrl: './group.component.html',
      styleUrls: ['./group.component.css']
    })
    export class GroupComponent implements OnInit {
    
      constructor(private groupService: GroupService, private firestore: AngularFirestore) { }
    
      ngOnInit() {
        this.resetForm();
      }
    
      resetForm(form ?: NgForm){
        if(form!= null)
          form.resetForm();
        this.groupService.formData = {
          $key : null,
          firstname: '',
          lastname: '',
          age: null
        }
      }
    
      onSubmit(form : NgForm){
        let data = form.value;
        // this.firestore.collection('groups').add(data);
        this.resetForm(form);
      }
    
    }

我得到的错误如下。

ERROR Error: StaticInjectorError(AppModule)[AngularFirestore -> InjectionToken angularfire2.app.options]: StaticInjectorError(Platform: core)[AngularFirestore -> InjectionToken angularfire2.app.options]: NullInjectorError: No provider for InjectionToken angularfire2.app.options! at NullInjector.push../node_modules/@angular/core/fesm5/core.js.NullInjector.get (core.js:8895) at resolveToken (core.js:9140) at tryResolveToken (core.js:9084) at StaticInjector.push../node_modules/@angular/core/fesm5/core.js.StaticInjector.get (core.js:8981) at resolveToken (core.js:9140) at tryResolveToken (core.js:9084) at StaticInjector.push../node_modules/@angular/core/fesm5/core.js.StaticInjector.get (core.js:8981) at resolveNgModuleDep (core.js:21217) at _createClass (core.js:21270) at _createProviderInstance (core.js:21234)

我点击了下面的链接，但没有运气。

Angular Fire Issue 1706

Angular Fire Issue 1416

No provider for InjectionToken angularfire2.app.options

下面是我的 app.module.ts 文件。

    import { BrowserModule } from '@angular/platform-browser';
    import { NgModule } from '@angular/core';
    import { AppComponent } from './app.component';
    import { environment } from '../environments/environment'
    import { AngularFireModule } from 'angularfire2';
    import { AngularFireDatabaseModule } from 'angularfire2/database';
    import { AngularFirestoreModule, AngularFirestore } from '@angular/fire/firestore';
    import { GroupsComponent } from './groups/groups.component';
    import { GroupComponent } from './groups/group/group.component';
    import { GroupListComponent } from './groups/group-list/group-list.component'
    import { GroupService } from './groups/shared/group.service';
    import { FormsModule } from '@angular/forms'
    
    
    @NgModule({
      declarations: [
        AppComponent,
        GroupsComponent,
        GroupComponent,
        GroupListComponent
      ],
      imports: [
        BrowserModule,
        AngularFirestoreModule,
        AngularFireDatabaseModule,
        AngularFireModule.initializeApp(environment.firebaseConfig),
        FormsModule
      ],
      providers: [AngularFirestore, GroupService],
      bootstrap: [AppComponent]
    })
    export class AppModule { }

Answer 1

我想我知道解决我问题的答案。我只需要将以下语句导入到我创建的服务中，并且需要在服务的构造函数中创建对象。

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

Answer 2

错误很可能来自尝试将AngularFirestore 添加到providers 的AppModule。当AngularFirestoreModule 被导入到模块中时，AngularFirestore 变得可以注入。从providers 中删除AngularFirestore：

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import { environment } from '../environments/environment'
import { GroupsComponent } from './groups/groups.component';
import { GroupComponent } from './groups/group/group.component';
import { GroupListComponent } from './groups/group-list/group-list.component'
import { GroupService } from './groups/shared/group.service';
import { FormsModule } from '@angular/forms';
import { AngularFireModule } from '@angular/fire';
import { AngularFirestoreModule } from '@angular/fire/firestore';
import { AngularFireDatabaseModule } from '@angular/fire/database';

@NgModule({
  declarations: [
    AppComponent,
    GroupsComponent,
    GroupComponent,
    GroupListComponent
  ],
  imports: [
    BrowserModule,
    AngularFireModule.initializeApp(environment.firebaseConfig),
    AngularFirestoreModule,
    AngularFireDatabaseModule,
    FormsModule
  ],
  providers: [GroupService],
  bootstrap: [AppComponent]
})
export class AppModule { }

还请注意更新的导入路径。这些路径直接来自installation documentation。

还要确保您的依赖项中只有@angular/fire，而不是@angular/fire 和 angularfire2。话虽如此，仅在您的导入中引用 @angular/fire 并从您的 package.json 和任何导入中删除 angularfire2。

希望对您有所帮助！

Answer 3

所以解决办法是从

导入AngularFirestore

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

而不是
import { AngularFirestore } from 'angularfire2/firestore';

希望对某人有所帮助