Question

111

How to increment a record in Firebase?

rated 0 times [ 114] [ 3] / answers: 1 / hits: 20016 / 9 Years ago, wed, july 15, 2015, 12:00:00

I have a Firebase record searches: 0 for each user. On some event, I'd like to add 1 to what the current count is. I've gotten this far, but for some reason, it's not working:

du.fbAddSearchCount = function() {

    var usr = new Firebase(firebase_url + /users/ + user_uid);



    usr.on(value, function(snapshot) {

        user = snapshot.val();



       var usersRef = ref.child(users);



       var fbUser = usersRef.child(user_uid);

       fbUser.update( {

           searches: user.searches + 1

       });

    }

}

Any help to get this working?

Thank you.

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daja

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answered 9 Years ago kennedysaraiw · Accepted Answer

There's a new method ServerValue.increment()in firebase JavaScript SDK v7.14.0

It's better for performance and cheaper since no round trip is required.

See here

Added ServerValue.increment() to support atomic field value increments without transactions.

API Docs here

Usage example:

firebase.database()

    .ref('users')

    .child(user_uid)

    .child('searches')

    .set(firebase.database.ServerValue.increment(1))

Or you can decrement, just put -1 as function arg like so:

firebase.database()

    .ref('users')

    .child(user_uid)

    .child('searches')

    .set(firebase.database.ServerValue.increment(-1))