如何使用 Angular Fire 连接到第二个数据库？-解网

问：

我有这个代码：

import { FirebaseApp } from "@angular/fire/compat";
import {
  AngularFirestore
} from "@angular/fire/compat//firestore";

import {
  initializeFirestore
} from "@angular/fire/firestore";

import { firestoreInstance$ } from "@angular/fire/firestore";

export class AppModule {
  constructor(private firestore: AngularFirestore) {
    const firebaseApp: FirebaseApp = this.firestore.firestore.app;

    initializeFirestore(firebaseApp, {}, secondDbName);

    firestoreInstance$.subscribe((instance) => {
      console.log("instance:", instance);
    });
  }
}

并一直在尝试获取非默认数据库的适当 firestore 实例。我遵循了 repo 提到的建议：

从理论上讲，有三个 API 应该在新 API 中允许这样做：

您应该能够注入到组件中以获取 firestore 实例的数组。他们会的必须在组件之前初始化。FirestoreInstances

有一个可观察的 firestoreInstance$，你可以从中导入，你可以过滤可观察的排放来获取所需的数据库。@angular/fire/firestore

您可以使用与 JS SDK 相同的 API 来获取访问权限（getFirestore 和 initializeFirestore，请参阅 databaseId 参数），只需从 @angular/fire/firestore 而不是 firebase/firestore 导入，因此您将获得 Zone.js 修复。

也就是说，我们只解锁了针对 Firebase JS SDK v10 的使用随着 AngularFire v16 的发布。所以我没有机会在这里做实验吧。

instance上面被多次记录，其中之一是我需要的数据库。但是，物体的形状只有三个键：

app和toJSONtype

用：角度 15 + 角度火 7.5

角度谷歌-云-Firestore 角火2

import { FirebaseApp } from "@angular/fire/compat";
import { AngularFirestore, getFirestore, Firestore } from "@angular/fire/compat/firestore";
import { firestoreInstance$ } from "@angular/fire/firestore";
import { Subscription } from "rxjs";

export class AppModule {
  private firestoreSubscription: Subscription | undefined;

  constructor(private firestore: AngularFirestore) {
    const firebaseApp: FirebaseApp = this.firestore.firestore.app;

    // Get access to the second Firestore instance
    const secondFirestore: Firestore = getFirestore(firebaseApp, { databaseId: 'your-second-db-name' });

    // Now you can use `secondFirestore` to interact with the second database

    // Subscribe to the firestoreInstance$ observable to get information about Firestore instances
    this.firestoreSubscription = firestoreInstance$.subscribe((instances) => {
      console.log("Firestore Instances:", instances);

      // Find the instance you need based on your criteria
      const secondInstance = instances.find((instance) => {
        // Adjust this condition based on the properties of your Firestore instance
        return instance.app.name === 'your-second-app-name';
      });

      if (secondInstance) {
        console.log("Second Firestore Instance:", secondInstance);
      }
    });
  }

  ngOnDestroy() {
    if (this.firestoreSubscription) {
      this.firestoreSubscription.unsubscribe();
    }
  }
}


import { getApp, initializeApp, provideFirebaseApp } from "@angular/fire/app";
import { initializeFirestore, provideFirestore } from "@angular/fire/firestore";

@NgModule({
  imports: [
    provideFirebaseApp(() => initializeApp(config)),
    provideFirestore(() => {
      const app = getApp();
      const dbName = "db-name";
      const providedFirestore = initializeFirestore(app, {}, dbName);
      return providedFirestore;
    }),
  ]
})

然后在您的服务中：

import { inject } from "@angular/core";
import { Firestore, getDocs } from "@angular/fire/firestore";
import {
  collection,
  query,
  where,
  orderBy,
} from "@angular/fire/firestore";

@Injectable({
  providedIn: "root",
})
export class MyService {
  private firestore: Firestore = inject(Firestore);

  getUsers() {
    return getDocs(
      query(
        collection(this.firestore, "Users"),
        where("some_id", "==", "id"),
        orderBy("created_at", "asc")
      )
    );
  }
}

这还可以让您连接到多个数据库并根据需要注入它们。

上一个：致命异常：com.google.android.gms.tasks.RuntimeExecutionException：com.google.firebase.firestore.FirebaseFirestoreException：PERMISSION_DENIED

下一个：Firestore 权限被拒绝，即使将规则设置为允许所有

如何使用 Angular Fire 连接到第二个数据库？

How to connect to a second database using Angular Fire?

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