Override $FirebaseArray.prototype.$$added in AngularFire (compatible with 0.9.x and above)

advanced.js

// create a class that we will use in place of the pojo (plain old javascript object)
// that is normally created in $FirebaseArray
function Person(snap) {
  this.$id = snap.name();
  this.updated(snap);
}
 
Person.prototype = {
  updated: function(snap) {
    this.data = snap.val();
    this.$priority = snap.getPriority();
    // can return false here if no updates occur
    // which will prevent $watch listeners from being notified
    return true;
  },
  
  getFullName: function() {
    return this.first_name + ' ' + this.last_name;
  },
  
  toJSON: function() {
    return this.data;
  }
}
 
// now override $FirebaseArray to return our Person class
return $FirebaseArray.$extendFactory({
  $$added: function(snap, prevChild) {
    // parse data and create record
    return new Person(snap);
  },
  
  $$updated: function(snap) {
    var rec = this.$getRecord(snap.name());
    if( rec !== null ) {
      return rec.updated(snap);
    }
    else {
      return false;
    }
  }
});

simple.js

return $FirebaseArray.$extendFactory({
  $$added: function(snap, prevChild) {
    var rec = $FirebaseArray.prototype.$$added.call(this, snap);
    rec.getFullName = function() { return this.first_name = ' ' + this.last_name; };
    return rec;
  }
}

The code for $FirebaseArray.$$added() includes checking for the existence of snap.key() before adding to the array. Is it ok to leave that sanity check out? (In the advanced.js around line 30)