New Twiddle

adapters.application.js

import DS from "ember-data";

export default DS.JSONAPIAdapter.extend();

components.the-pets.js

import Ember from 'ember';

export default Ember.Component.extend({
  allPets: Ember.computed('people.@each.pets', function() {
    let people = this.get('people');
    let pets = [];
    people.forEach(p => pets.pushObjects(p.get('pets').toArray()));
    return pets;
  }),
  missingPetNames: Ember.computed('allPets.@each.name', function() {
    let requiredPets = ['Felix', 'Jonny'];
    let allPets = this.get('allPets');
    let missingPetNames = [];
    console.log(allPets.get('firstObject.id'));
    requiredPets.forEach(p => {
      if (!allPets.any(a => a.get('name') === p)) {
        missingPetNames.pushObject(p);
      }
    });
    
    return missingPetNames;
  })
});

initializers.pretender.js

export function returnJSON(status, body) {
  return json(...arguments);
};

export function json(status, body) {
  if (arguments.length === 1) {
    body = status;
    status = 200;
  }
  
  return [
    status,
    { "Content-Type": "application/json" },
    JSON.stringify(body)
  ];
};

export const server = new Pretender();

export function initialize() {
  server.handledRequest = function(verb, path, request) {
    console.log(`handled request to ${verb} ${path}`);
  }

  server.unhandledRequest = function(verb, path, request) {
    console.log(`undhandled request ${verb} ${path}`);
  }
};

export default {
  name: 'pretender',
  initialize
};

models.person.js

import DS from "ember-data";
import { hasMany } from 'ember-data/relationships';

const { Model, attr } = DS;

export default Model.extend({
  name: attr(),
  pets: hasMany('pet', {async: true})
});

models.pet.js

import DS from "ember-data";
import { belongsTo } from 'ember-data/relationships';

const { Model, attr } = DS;

export default Model.extend({
  name: attr(),
  
  person: belongsTo('person', {async: true})
});

routes.application.js

import Ember from 'ember';
import { server, json } from '../initializers/pretender';

server.map(function() {
  this.get('/people', function() {
    return json({
      data: [{
        type: 'person',
        id: 1,
        attributes: {
          name: 'George Michael Bluth'
        },
        relationships: {
          pets: {
            data: [
              {
                id: 122,
                type: 'pet'
              },
              {
                id: 138,
                type: 'pet'
              }
            ]
          }
        }
      },
      {
        type: 'person',
        id: 2,
        attributes: {
          name: 'Adam K'
        },
        relationships: {
          pets: {
            data: [
              {
                id: 203,
                type: 'pet'
              }
            ]
          }
        }
      }]
    });
  });
  
  this.get('/pets/122', function() {
    return json({
      data: {
        type: 'pet',
        id: 122,
        attributes: {
          name: 'Snoopy'
        }
      }
    });
  });
  
  this.get('/pets/138', function() {
    return json({
      data: {
        type: 'pet',
        id: 138,
        attributes: {
          name: 'Scooby'
        }
      }
    });
  });
  
  this.get('/pets/203', function() {
    return json({
      data: {
        type: 'pet',
        id: 203,
        attributes: {
          name: 'Felix'
        }
      }
    });
  });
});

export default Ember.Route.extend({
  model: function() {
    return this.store.findAll('person');
  }
});

serializers.application.js

import DS from "ember-data";

export default DS.JSONAPISerializer.extend();

templates.application.hbs

{{#each model as |person id|}}
<p>Name: {{person.name}}</p>
{{/each}}
<h4>All the pets:</h4>
{{the-pets people=model}}

templates.components.the-pets.hbs

{{#each allPets as |pet id|}}
<p><i>{{pet.name}}</i></p>
{{/each}}
<h4>Missing Pets</h4>
{{#each missingPetNames as |name|}}
<p>{{name}}</p>
{{/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": "release",
    "ember-data": "canary",
    "ember-template-compiler": "release",
    "route-recognizer": "https://rawgit.com/tildeio/route-recognizer/56f5fcec6ae58d8e86b5dc77609809fb91198142/dist/route-recognizer.js",
    "FakeXMLHttpRequest": "https://rawgit.com/pretenderjs/FakeXMLHttpRequest/23c3a96b5b24f1bfe595867437e4f128a29c2840/fake_xml_http_request.js",
    "pretender": "https://rawgit.com/pretenderjs/pretender/c6de9afe18b1472aded2592f5a80ad9a26a0e262/pretender.js"
  }
}