FirebaseListObservable emits duplicate values for first insert #73
Description
If I subscribe to an empty list, and then add a new value to that list it looks like that value is getting emitted twice. For example if I do:
let observable = this._angularFire.list('my_path', {preserveSnapshot: true});
observable.subscribe ((l) => {
console.log('length', l.length);
});
setTimeout(() => {
observable.add({text: 'new'});
}, 1);If 'my_path' is initially empty this will output:
length 1
length 2
The 2 is erroneous and contains a duplicate entry.
It doesn't look like this problem occurs if 'my_path' is not initially empty.