Setting priority while pushing in firebase //credit:kato

gistfile1.js

var ref = new Firebase('https://<example>.firebaseio.com/rewards').push();

ref.setWithPriority({
  name: 'apple',
  otherKey: 'somevalue',
  ...
}, 'apple', function(err) {
   if( error ) { console.error(err); }
   else {
      fetchValue();
   }
});

function fetchValue() {
   // wait for the set to complete before fetching data
   new Firebase('https://<example>.firebaseio.com/rewards')
     .startAt('apple')
     .endAt('apple')
     .once('value', function(snap) {
        console.log('found:', snap.val()); // logs: "found null"
     }); 
}