Ember .content.content

1

Overall, I generally like Ember and Ember data but sometimes I want to pull my hair our when accessing the manyArrays for hasMany relationships. For example, I have models where a Student hasMany Lessons, loaded async (getting it to sideload properly is a whole other nightmare). This all hooks together fine, but when attempting to iterate over this, I run into so much .content nesting I fear I must be doing something wrong:

var = lessons = this.get('lessons'); // model is a student

Only returns one object. In order to get to the array I must fetch two levels deeper: this.get('lessons.content.content'). This seems non-idiomatic. And even after going that deep, and finding the actual array, each element in the array is another mess without my data in it. I believe this has something to do with Promises not having resolved but I feel this use case is incredible simple and common so can anyone see what I’m missing? Even if I wrap the code as this.get('lessons').then(...) I get an error that lessons is undefined as my model has fulfilled yet. Isn’t Ember supposed to deal with this asynchrony?

// bower.json
"ember": "1.8.1",
"ember-data": "1.0.0-beta.12",

// models/school.js
import DS from 'ember-data';
import EmberValidations from 'ember-validations';
import Entity from './entity';

export default Entity.extend(EmberValidations.Mixin, {
  name:                  DS.attr('string'),
  info:                  DS.attr('string'),
  students:              DS.hasMany('student', { async: true }),
});

// models/student.js
import DS from 'ember-data';
import Entity from './entity';

export default Entity.extend({
  name:    DS.attr('string'),
  email:   DS.attr('string'),
  picture: DS.attr('string'),
  lessons: DS.hasMany('lesson', { async: true }),
  school:  DS.belongsTo('school', { async: true }),
});

// models/lesson.js
import Ember from 'ember';
import DS from 'ember-data';
import EmberValidations from 'ember-validations';

export default DS.Model.extend(EmberValidations.Mixin, {
  name: Ember.computed('lessonType', function() {
    return ["Introductions", "Educational Culture", "Etiquette", "Public Speaking", "Residential and Social life", "Excelling in the U.S. System", "Teamwork", "Planning & Transition", "Time & Resources Management", "Long-Term Aspirations", "Shearwater Elective & Final Planning"][this.get('lessonType') - 1];
  }),
  lessonType:               DS.attr('number'),
  score:                    DS.attr('number'),
  student:                  DS.belongsTo('student', { async: true }),
});

import DS from 'ember-data';

export default DS.Model.extend({
  user: DS.belongsTo('user', { async: true })
});