HABTM

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember HABTM'
});

models.adventure.js

import DS from 'ember-data';

export default DS.Model.extend({
  selections: DS.hasMany('selection'),
});

models.path.js

import DS from 'ember-data';

export default DS.Model.extend({
  body: DS.attr('string'),

  selections: DS.hasMany('selection')
});

models.selection.js

import DS from 'ember-data';

export default DS.Model.extend({
  adventure: DS.belongsTo('adventure'),
  path: DS.belongsTo('path')
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model: function() {
    let path = this.store.createRecord('path', {
      body: "Hello World"
    });
    let selection = this.store.createRecord('selection', { path });
    let adventure = this.store.createRecord('adventure', { selection });
    
    return Ember.RSVP.hash({
      paths: this.store.findAll('path'),
      selections: this.store.findAll('selection'),
      adventures: this.store.findAll('adventure')
    })
    
  }
});

templates.application.hbs

{{appName}}
<br>
{{#each model.paths as |path|}}
  {{path.body}}
{{/each}}

twiddle.json

{
  "version": "0.7.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember-template-compiler.js"
  }
}