import { AngularFireDatabase, FirebaseListObservable } from “angularfire2/database”;

问题

i had problem to

import { AngularFireDatabase, FirebaseListObservable } from "angularfire2/database";

i imported AngularFireDatabase but FirebaseListObservable was under a red line after searching this post helped me resolve my problem Getting an error: "Has no exported member AngularFire, AuthProviders, AUthMethods, FirebaseListObservable" in AngularFire2?

import { AngularFireDatabase, FirebaseListObservable } from "angularfire2/database-deprecated";

but when i compile i get and it cant help i dont know what to do where searching ect core.es5.js:1020 ERROR Error: Uncaught (in promise): Error: No provider for AngularFireDatabase! Error: No provider for AngularFireDatabase!

"angularfire2": "^5.0.0-rc.2", "core-js": "^2.4.1", "firebase": "^4.5.0",

回答1:

In angularfire2": "^5.0.0-rc.2 you can't use FirebaseListObservable instead you will have to use

import { AngularFireDatabase } from 'angularfire2/database';

and use it like this

constructor(public af: AngularFireDatabase) {
  let restaurants = this.af.list('/path');
}

回答2:

i got the answer after reading https://github.com/angular/angularfire2/blob/master/CHANGELOG.md 5.0.0-rc.0 (2017-10-03)

the -deprecated allows you to use the old database API

import { AngularFireDatabaseModule } from 'angularfire2/database-deprecated';

in the app.module.js and in your service you use

 import { AngularFireDatabase, FirebaseListObservable } from "angularfire2/database-deprecated";

thank you both of you, you helped me

回答3:

You need to import the following and add it under your app.module.ts

import { AngularFireModule } from 'angularfire2';
import { AngularFireDatabaseModule } from 'angularfire2/database';


@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    AngularFireModule.initializeApp(firebaseConfig),
    AngularFireDatabaseModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

来源：https://stackoverflow.com/questions/46651154/import-angularfiredatabase-firebaselistobservable-from-angularfire2-databa

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