CODEWITHSUNDEEP
javascriptarraysfirebasefirebase-realtime-database
SyrupandSass
SyrupandSass

Reputation: 345

Get array of items from Firebase snapshot

I'm trying to get an array of items from my Firebase database, using a snapshot generated on page load. I've added the value of each object to an array, and now I'm trying to push an item from each object into another array with a for loop.

But when I create the second array, there are more items in it than there are objects in the snapshot.

I'm wondering how I can get around this. Any help would be awesome. Thanks.

Code: 

var ref = firebase.database().ref().child('/scenes/' + projId).orderByChild('wordcount');
ref.once('value',function(snap) {
    snap.forEach(function(item) {
        var itemVal = item.val();
        keys.push(itemVal);
        for (i=0; i < keys.length; i++) {
            counts.push(keys[i].wordcount);
        }
    });
});

Upvotes: 9

Views: 37561

Answers (3)

Yannick
Yannick

Reputation: 1600

You can just use lodash _.toArray()

_.toArray(snapshot.val()) will convert your object into an array of objects.

Documentation

Upvotes: 8

CWProduction
CWProduction

Reputation: 11

@mike axle: Just add return true inside forEach. It works for me... ;)

Upvotes: 1

Mathew Berg
Mathew Berg

Reputation: 28750

Each time you add something to keys you loop over them all again. You should probably move it outside your forEach:

var ref = firebase.database().ref().child('/scenes/' + projId).orderByChild('wordcount');
ref.once('value',function(snap) {
    snap.forEach(function(item) {
        var itemVal = item.val();
        keys.push(itemVal);
    });
    for (i=0; i < keys.length; i++) {
        counts.push(keys[i].wordcount);
    }   
});

Upvotes: 18

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