Unable to get JSON response from RoR backend using EmberJS and Ember-data

Question

I kno this is a bit tricky question. The thing is I have connected succesfully two models with complex relationships (using joining tables between them and so on) between my Ruby on Rails backend and Ember/Ember-Data through a JSON response.

Know, the problem is I am not able to connect a third model. Its ids are embedded on another model working fine. The thing is even I am getting a working JSON response with the data indeed, but my ember-data model is not getting them for some reason on my ember controller.

This is the model I am trying to get:

Profile.js

App.Adapter.map
(
  'App.Profile',
  {
    projects: {embedded: 'load'},
    people: {embedded: 'load'}
  }
);

App.Profile = DS.Model.extend
(
   {
      name: DS.attr('string'),
      tools: DS.attr('string'),
      number: DS.attr('number'),
      projects: DS.hasMany('App.Project', {embedded: 'load'}),
      people: DS.hasMany('App.Person', {embedded: 'load'})
   }
);

The model Person.js, whose JSON response is being valid returned:

App.Adapter.map
(
  'App.Person',
  {
    profiles: {embedded: 'load'},
    projectsCreated: {embedded: 'load'},
    projects: {embedded: 'load'},
    friends: {embedded: 'load'}
  }
);

App.Person = DS.Model.extend
(
   {
      name: DS.attr('string'),
      place: DS.attr('string'),
      email: DS.attr('string'),
      password: DS.attr('string'),
      academic: DS.attr('string'),
      professional: DS.attr('string'),
      profiles: DS.hasMany('App.Profile', {embedded: 'load'}),
      knowledge: DS.attr('string'),
      projectsCreated: DS.hasMany('App.Project', {embedded: 'load'}),
      projects: DS.hasMany('App.Project', {embedded: 'load'}),
      friends: DS.hasMany('App.Person', {embedded: 'load'}),
      iconUrl: DS.attr('string')
   }
);

The serializers profile_serializer.rb and person_serializer.rb used for each one:

class ProfileSerializer < ActiveModel::Serializer
  attributes :id,
             :name,
             :tools,
             :number

  has_many :projects, ember: :id
  has_many :people, ember: :id           
end

class PersonSerializer < ActiveModel::Serializer
  attributes :id,
             :name,
             :place,
             :email,
             :password,
             :academic,
             :professional,
             :knowledge,
             :icon_url

  has_many :friends, embed: :id
  has_many :projects_created, embed: :id
  has_many :projects, embed: :id
  has_many :profiles, embed: :id
end       

And, at the end, the JSON responses:

GET http://localhost:3000/people 

{
    "people": [
        {
            "id": 1,
            "name": "Daniel",
            "place": "Ireland",
            "email": "[email protected]",
            "password": "123456",
            "academic": "Computing Engineer",
            "professional": "Fundecor",
            "knowledge": "html, css, javascript, jquery, ember",
            "icon_url": "http://imageshack.us/a/img196/6619/xckl.jpg",
            "friend_ids": [
                2,
                3
            ],
            "projects_created_ids": [
                1
            ],
            "project_ids": [],
            "profile_ids": [
                1,
                3,
                5
            ]
        },
        {
            "id": 2,
            ...
        },
        {
            "id": 3,
            ...
        }
    ]
}

And the next step is query for this profile_ids whose right answer is:

GET http://localhost:3000/profiles?ids%5B%5D=1&ids%5B%5D=3&ids%5B%5D=5

{
    "profiles": [
        {
            "id": 1,
            "name": "Frontend",
            "tools": "html, css, javascript, jquery",
            "number": 0,
            "projects": [],
            "people": [
                {
                    "id": 1,
                    "name": "Daniel",
                    "place": "Ireland",
                    "email": "[email protected]",
                    "password": "123456",
                    "academic": "Computing Engineer",
                    "professional": "Fundecor",
                    "knowledge": "html, css, javascript, jquery, ember",
                    "icon_url": "http://imageshack.us/a/img196/6619/xckl.jpg",
                    "friend_ids": [
                        2,
                        3
                    ],
                    "projects_created_ids": [
                        1
                    ],
                    "project_ids": [],
                    "profile_ids": [
                        1,
                        3,
                        5
                    ]
                }
            ]
        },
        {
            "id": 2,
            "name": "Mobile Developer",
            ...
        },
        ...
    ]
}

All the profiles entries are returned. But the thing is, when I try to get this through my controller or my route, the result getting on the browser console (firebug or similar) is empty. Every field of person is right filled, including profile_ids, but not the profile model itself.

Maybe, if you want to have the whole code itself, you can check it on https://github.com/neil89/project-on. Thank you a lot in advance for your answers.