Firebase.database（）不是函数-Sails Service

Question

I've made a service called Firebase.js, and I am then trying to call this from my Controllers using the likes of Firebase.database , however I get the error Firebase.database() is not a function

services/Firebase.js

var admin = require("firebase-admin");

var instance = admin.initializeApp({
        credential: admin.credential.cert({
          [[cert info]]
        }),
        databaseURL: "foo.com"
    })

module.exports.default = instance;

Controller

    var db = Firebase.database();
    var ref = db.ref("my-db");
    var brandsRef = ref.child("brands");

    brandsRef.once("value", function(data){
        console.log(data);
    })

I'm not too sure where I am going wrong. Any suggestions?

Answer 1

services/Firebase.js

var admin = require("firebase-admin");

var serviceAccount = require("path/to/serviceAccountKey.json");

var instance = admin.initializeApp({
  credential: admin.credential.cert(serviceAccount),
  databaseURL: "https://YOUR_DATABASE_NAME.firebaseio.com"
});

module.exports.firebaseDB = instance.database();// Export the database object

Controller

//Don't need initialize the Firebase again, only call function from service
var ref = Firebase.firebaseDB.ref("/your_resource");
ref.once("value", function(snapshot) {
  return res.json({MY_RESOURCE_DATA: snapshot.val()});
});

Where Firebase is the service file name and firebaseDB is the database object that export for use in the service.

Answer 2

In your controller you should be initializing the database for usage. The code looks similar to this:

var config = {
    apiKey: "Sample api key here",
    authDomain: "yourapplication.firebaseapp.com",
    databaseURL: "yourapplication.firebaseio.com",
    storageBucket: "yourapplication.appspot.com",
    messagingSenderId: "Id number here"
  };
firebaseObject.initializeApp(config);

firebaseObject would then be the object that you use for the database reference, like so:

var db = firebaseObject.database();
var ref = db.ref("my-db");

Answer 3

也许问题是您使用的是大写字母，请使用firebase.database() 。

Answer 4

in the controller you have to do

var db = Firebase.database();
var ref = db.ref("my-db");
var brandsRef = ref.child("brands");

brandsRef.once('value').then{function(snapshot){
    console.log(snapshot.val()._name data from firebase__);
});