CODEWITHSUNDEEP
node.jsfirebasefirebase-realtime-databasefirebase-admin
BulletCatcher
BulletCatcher

Reputation: 3

Firebase from Node: no response from callback?

I'm trying to get Hello World working here -- just get my Node script to talk to Firebase. I made a script I think should read the "stories" collection, but I get no response from Firebase. I'm sure I'm missing something incredibly basic. Please help!

var db = admin.database();
var ref = db.ref("stories");

ref.on("value", function(snapshot) {
  console.log(snapshot.val());
}, function (errorObject) {
  console.log("The read failed: " + errorObject.code);
});
console.log('exiting');

...but what I get is:

p:0: Browser went online.
p:0: Listen called for /stories default
exiting
p:0: Making a connection attempt
p:0: Auth token refreshed
getToken() completed. Creating connection.
c:0:0: Connection created
c:0:0:0 Websocket connecting to wss://*****.firebaseio.com/.ws?v=5

I kludged on a way to wait longer, and got this:

p:0: Browser went online.
p:0: Listen called for /stories default
exiting
p:0: Making a connection attempt
p:0: Auth token refreshed
getToken() completed. Creating connection.
c:0:0: Connection created
c:0:0:0 Websocket connecting to wss://*****.firebaseio.com/.ws?v=5
c:0:0: Closing unhealthy connection after timeout.
c:0:0: Closing realtime connection.
c:0:0: Shutting down all connections
c:0:0:0 WebSocket is being closed
p:0: data client disconnected
p:0: Trying to reconnect in 0ms
0: onDisconnectEvents
p:0: Making a connection attempt
getToken() completed. Creating connection.
c:0:1: Connection created
c:0:1:0 Websocket connecting to wss://*****.firebaseio.com/.ws?v=5
c:0:0:0 Websocket connection was disconnected.

What am I doing wrong?

Upvotes: 0

Views: 394

Answers (2)

Thang Duc
Thang Duc

Reputation: 326

you talked about collection, so I think you're working on Cloud Firestore, not Realtime Database. So the code should be:

const db = admin.firestore();
db.collection('stories').get()
    .then((snapshot) => {
        snapshot.forEach((doc) => {
            console.log(doc.id, '=>', doc.data());
        });
    })
    .catch((err) => {
        console.log('Error getting documents', err);
    });

Please have a look this image: enter image description here

Upvotes: 1

Doug Stevenson
Doug Stevenson

Reputation: 317372

Tru once() instead of on(). once() just queries a single time and returns a promise. on() establishes a listener that run until you remove it, and it doesn't return a promise.

ref.once('value')
.then(snapshot => {
    console.log(snapshot.val());
})
.catch(error => {
    console.error(error);
});

Upvotes: 0

Related Questions