Using Firebase, Firebase.auth().currentuser Is A Null Value Even Though It Is Being Logged

I created a query that is in a service.TS file that shows an items 'state' that is based on a logged in user's UID: getLists(): FirebaseListObservable { firebase.auth()

Solution 1:

onAuthStateChanged() is asynchronous, so when you have the user uid in its callback, then only perform your operation, like this:

getLists(): FirebaseListObservable<any> {

    var self = this;

    firebase.auth().onAuthStateChanged(function(user) {
        if (user) {
            // User is signed in.
            var userID = user.uid;

            return self.db.list('/foods', {
                query: {
                    orderByChild: 'state/' + userID + '/state',
                    equalTo: 'listed'
                }
            });
        }
    });

}