{{each}} of computed property

gistfile1.txt

models:

App.Lesson = DS.Model.extend({
  contentCards: DS.hasMany('contentCard', { async: true }),
  
  learningObjectives: function() {
    return this.get('contentCards')
      .mapBy('assignedLearningObjectives')
      .flatten()
      .mapBy('learningObjective')
      .uniq()
      .sortBy('sortOrder');
  }.property().volatile() // yes it has come to this
});

App.ContentCard = DS.Model.extend({
  lesson: DS.belongsTo('lesson'),
  assignedLearningObjectives: DS.hasMany('assignedLearningObjective', { async: true })
});

App.AssignedLearningObjective = DS.Model.extend({
  contentCard: DS.belongsTo('contentCard'),
  learningObjective: DS.belongsTo('learningObjective')
});

App.LearningObjective = DS.Model.extend({
  assignedLearningObjectives: DS.hasMany('assignedLearningObjective', { async: true })
});

template:

{{#each learningObjective in view.lesson.learningObjectives}}
  {{learningObjective.title}}
{{/each}}