don't you want to filter the subjects a little more? from what I understand, the http://cdl.ubervu.com/api/v1/userstosubjects/?user_id=3 returns you some subjects a user attends, and in the `/subjects` endpoint you receive all the subjects. You need to pick only the subjects that the user attends to, need you not?

Even though, it's good to have something working first, than do that.