FirebaseError：Firebase：未创建 Firebase 应用“[DEFAULT]” - 调用 Firebase App.initializeApp() (app/no-app)。在应用程序

Question

我正在学习如何在 Ionic + Angular 项目中使用 Firebase 函数。

我想创建我的自定义函数，它将获取所有游戏（一个集合）并按名为“count”的属性的顺序返回一个包含这些游戏的数组。我的第一步是获取所有游戏并展示以了解结构。

不幸的是，当我运行命令 firebase emulators:start 并访问我的函数“getMostPlayedGames”时，会出现此错误：

FirebaseError: Firebase: No Firebase App '[DEFAULT]' has been created call Firebase App.initializeApp() (app/no-app). at app

这是我的index.ts

import * as functions from 'firebase-functions';
import * as admin from 'firebase-admin';
import firebase from 'firebase';

admin.initializeApp();

export const helloWorld = functions.https.onRequest((req, res) => {
    res.send('Hello world');
});

export const deleteExpiredSessions = functions.https.onRequest((req, res) => {
    functions.logger.info('Automatic cleaning - Delete expired sessions from Database', { structuredData: true });
    res.send('Automatic cleaning - Delete expired sessions from database');
});

export const getMostPlayedGames = functions.https.onRequest((req, res) => {
    const db = firebase.firestore();
    const games = db.collection('games');
    console.log(games);
    functions.logger.info('Get all games', { structuredData: true });
    res.send(games);
});

“HelloWorld”功能有效。

Answer 1

在 Cloud Function 中，如果您想与 Firebase 服务（例如 Firestore）进行交互，您需要使用 Admin SDK。

因此，以下更改（请参阅 cmets // ...）应该可以解决问题（未经测试）

import * as functions from 'firebase-functions';
import * as admin from 'firebase-admin';

// import firebase from 'firebase';    COMMENTED OUT

admin.initializeApp();

export const helloWorld = functions.https.onRequest((req, res) => {
    res.send('Hello world');
});

export const deleteExpiredSessions = functions.https.onRequest((req, res) => {
    functions.logger.info('Automatic cleaning - Delete expired sessions from Database', { structuredData: true });
    res.send('Automatic cleaning - Delete expired sessions from database');
});

export const getMostPlayedGames = functions.https.onRequest((req, res) => {
    const db = admin.firestore();   // CHANGED
    const games = db.collection('games');
    console.log(games);
    functions.logger.info('Get all games', { structuredData: true });
    res.send(games);
});