Associating records and promise scope

I’m trying to get my head around Ember Data by creating a simple attendance app. The goal is to have a student type in their name and hit submit, creating a new Attendance record that is associated with that student. Here’s what I’ve done to make it work:

App.Student = DS.Model.extend({
  name: DS.attr('string'),
  attendances: DS.hasMany('attendance', { async: true })

App.Attendance = DS.Model.extend({
  student: DS.belongsTo('student', { async: true }),
App.NewAttendanceController = Ember.ObjectController.extend({
  content: {},
  actions: {
    createAttendance: function() {
      var studentName = this.get('name');'student', { name: studentName })
      .then(function(fulfilledPromise) {
        var student = fulfilledPromise.get('firstObject');
        var attendance ='attendance', {
          time: moment(),
          student: student

So this works, but it feels really strange, especially everything in the .then() callback. I also found out that the scope in .then() is completely different from what I expected (I don’t have access to any variables above, for instance). Anyway, any insight would be much appreciated. Thanks!