private noteListRef = this.db.list<Note>(`note-list/${auth.uid}`);


constructor(private db: AngularFireDatabase, private fire:AngularFireAuth) {

getNoteList() {
    return this.noteListRef;
}

addNote(note: Note) {
    return this.noteListRef.push(note);
}

updateNote(note: Note) {
    return this.noteListRef.update(note.key, note);
}

removeNote(note: Note) {
    return this.noteListRef.remove(note.key);
}