ember data many many

adapters.application.js

import DS from 'ember-data';

export default DS.RESTAdapter.extend({
  namespace: 'api'
});

controllers.application.js

import Ember from 'ember';

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

helpers.eq.js

import Ember from 'ember';

export function eq(params) {
  return params[0] === params[1];
}

export default Ember.Helper.helper(eq);

helpers.map-by.js

import Ember from 'ember';
import { mapBy } from 'ember-computed';
import Helper from 'ember-helper';
import get from 'ember-metal/get';
import observer from 'ember-metal/observer';
import set from 'ember-metal/set';
import { isEmpty } from 'ember-utils';

const { defineProperty } = Ember;

export default Helper.extend({
  compute([byPath, array]) {
    set(this, 'array', array);
    set(this, 'byPath', byPath);

    return get(this, 'content');
  },

  byPathDidChange: observer('byPath', function() {
    let byPath = get(this, 'byPath');

    if (isEmpty(byPath)) {
      defineProperty(this, 'content', []);
      return;
    }

    defineProperty(this, 'content', mapBy('array', byPath));
  }),

  contentDidChange: observer('content', function() {
    this.recompute();
  })
});

models.post-tag.js

import DS from 'ember-data';

export default DS.Model.extend({
	post: DS.belongsTo('post'),
	tag: DS.belongsTo('tag')
});

models.post.js

import DS from 'ember-data';

export default DS.Model.extend({
	title: DS.attr('string'),
	body: DS.attr('string'),
	postTags: DS.hasMany('postTag')
});

models.tag.js

import DS from 'ember-data';

export default DS.Model.extend({
	name: DS.attr('string'),
	postTags: DS.hasMany('postTag')
});

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none'
});

Router.map(function() {
  this.route('posts', function() {
  });
  this.route('tags', function() {
    this.route('show', {path: '/:tag_id'});
  });
});

export default Router;

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
     init() {
    this._super(...arguments);
    
    $.mockjax({
      url: '/api/posts',
      responseText: {
   "posts": [
     {
  "id": 1,
  "title": "foo",
  "body": "foo",
  "postTags": [1,2]
     },
         {
  "id": 2,
  "title": "bar",
  "body": "bar",
  "postTags": []
     }      
            ]
        }  
      });
       
       
           $.mockjax({
      url: '/api/tags',
      responseText: {
   "tags": [
     {
  "id": 1,
  "name": "tech",
  "postTags": [1]
     },
         {
  "id": 2,
  "name": "food",
  "postTags": [2]
     }      
            ]
        }  
      });
       
$.mockjax({
      url: '/api/tags/1',
      responseText: {
   "tag": 
     {
  "id": 1,
  "name": "tech",
  "postTags": [1]
     }
        }  
      });
    
              
$.mockjax({
      url: '/api/tags/2',
      responseText: {
   "tag": 
     {
  "id": 2,
  "name": "food",
  "postTags": [2]
     }
        }  
      });
       
 $.mockjax({
      url: '/api/postTags',
      responseText: {
   "postTags": [
     {
  "id": 1,
  "post": 1,
	"tag": 1
     },
 ]
        }  
      });
     
        $.mockjax({
      url: '/api/postTags/1',
      responseText: {
   "postTag": 
     {
  "id": 1,
  "post": 1,
	"tag": 1
     }
        }  
      });
       
               $.mockjax({
      url: '/api/postTags/2',
      responseText: {
   "postTag": 
     {
  "id": 2,
  "post": 1,
	"tag": 2
     }
        }  
      });
     
  },
});

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
  redirect() {
    this.replaceWith('posts');
  }
});

routes.posts.index.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return this.modelFor('posts');
  } 
});

routes.posts.js

import Ember from 'ember';

export default Ember.Route.extend({

  model() {
    return this.store.findAll('post');
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
{{link-to 'posts' 'posts'}}
<br>
<br>
{{outlet}}
<br>
<br>

templates.posts.index.hbs

<ul>
{{#each model as |post|}}
	<li>
  {{post.title}}
  <ul>
  	{{#each post.postTags as |postTag|}}
      {{#unless (eq postTag.tag.name "tech") }}
    	<li>
      
    	{{postTag.tag.name}}
      </li>
      {{/unless}}
    {{/each}}
  </ul>
  
  
  {{#each (map-by "tag.name" post.postTags) as |n|
  }}
  {{n}}
  {{/each}}
  
  </li>
{{/each}}
</ul>

twiddle.json

{
  "version": "0.7.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "release",
    "ember-data": "release",
    "ember-template-compiler": "release",
    "jquery-mockjax": "https://cdnjs.cloudflare.com/ajax/libs/jquery-mockjax/1.6.2/jquery.mockjax.js"

  }
}