如何查询Firebase JavaScript 2.4.2和AngularFire 1.2.0以将$ id与嵌套集合中的另一个$ id相匹配

I have been working with Firebase for a few months now and just when I think I have a good working understanding, I get thrown for a loop. I come from a SQL background, so it has been a challenge working with NoSQL.I have been working with Firebase for a few mon