AngularFireModule from @angular/fire/compat not providing the database appropriately.

首先，使用所示的 app.config.ts 和注入 AngularFireDatabase 的 Postingservice 复现注入错误。结合 standalone provider 设置阅读 compat 数据库设置，然后验证可以注入 AngularFireDatabase，并且 viewPosts() 能够读取 /posts，而不会出现 No provider found 错误。

So I've been facing an issue for the past couple of days where whenever I try to use the AngularFireDatabase database to read or write to my Firebase database my console gives me the error:

No provider found for Database2. Source: Standalone[_Homecomponent].

I'm currently running Angular 20.0 as AngularFire 21.0 is yet to be fully fleshed out.

My dummy service to test the data looks like this below:

import { Injectable } from '@angular/core';
import { AngularFireDatabase } from '@angular/fire/compat/database';
@Injectable({
providedIn: 'root'
})
export class Postingservice {
constructor(private afDb:AngularFireDatabase){}
viewPosts(){
return this.afDb.list("/posts").valueChanges();
}
}

I've both tried instantiating the afDb in the constructor and using the inject() function and neither have worked to any avail.

Here also is my app.config.ts:

import { ApplicationConfig, provideBrowserGlobalErrorListeners, provideZoneChangeDetection } from '@angular/core';
import { provideRouter } from '@angular/router';

import { initializeApp, provideFirebaseApp } from '@angular/fire/app';
import { getDatabase, provideDatabase } from '@angular/fire/database';
import { routes } from './app.routes';

export const appConfig: ApplicationConfig = {
providers: [
provideBrowserGlobalErrorListeners(),
provideZoneChangeDetection({ eventCoalescing: true }),
provideRouter(routes),
provideFirebaseApp(() =>
initializeApp({
// FIREBASE CONFIG DATA
})),
provideDatabase(() => getDatabase()),
]
};

I've even provided the provideDatabase() function even as it's not necessary for the AngularFireDatabase as a provider and likewise it's been to no avail...

And my application is bootstrapping correctly as it runs just fine until I create an instance of the afDb database in a component where I then get the above stated error. Kindly help.