Ember Model

app.js

var App = window.App = Ember.Application.create();

App.Router.map(function () {
  this.resource('projects', {path: '/projects'}, function(){
    this.route('new');
    this.resource('project', {path: '/:project_id'}, function(){
      this.route('edit');
      this.resource('members', {path: '/members'},function(){
        this.route('add');
        this.route('edit',{path: '/:member_id/edit'});
      });
      this.resource('sprints', {path: '/sprints'}, function(){
        this.route('new');
        this.resource('sprint', {path: '/:sprint_id'}, function(){
          this.route('edit');
          this.resource('stories', {path: '/stories'}, function(){
            this.route('new');
            this.resource('story', {path: '/:story_id'}, function(){
              this.route('edit');
              this.resource('tasks', {path: '/tasks'}, function(){
                this.route('new');
                this.resource('task', {path: '/:task_id'}, function(){
                  this.route('edit');
                  this.resource('timeEntries', {path: '/timeEntries'}, function(){
                    this.route('new');
                    this.resource('timeEntry', {path: '/:timeEntry_id'}, function(){
                      this.route('edit');
                    });
                  });
                });
              });
            });
          });
        });
      });
    });
  });
});


App.IndexRoute = Em.Route.extend({
  redirect: function(){
    this.transitionTo('projects');
  }
});

App.ProjectsRoute = Em.Route.extend({
  model: function () {
    return App.Project.find();
  }
});

App.SprintsRoute = Em.Route.extend({
  model: function () {
    return App.Sprint.find();
  }
});

App.PersonsRoute = Em.Route.extend({
  model: function () {
    return App.Person.find();
  }
});

handlebars

    <script type="text/x-handlebars">
      <h2>Scrums</h2>
      {{outlet main}}
    </script>
    
    <script type="text/x-handlebars" data-template-name="projects">
      <h4>{{#linkTo projects}}Projects{{/linkTo}}</h4>
      <ul>
      {{#each item in model}}
        <li>{{#linkTo sprints item}}{{item.name}}{{/linkTo}}</li>
      {{/each}}
      </ul>
      <hr>
      {{outlet}}
    </script>

    <script type="text/x-handlebars" data-template-name="project">
      <h4>{{name}}</h4>
      <ul>
      {{#each item in sprints}}
        <li>{{#linkTo sprint item }}{{item.name}}{{/linkTo}}</li>
      {{/each}}
      </ul>
      {{outlet}}
    </script>

    <script type="text/x-handlebars" data-template-name="sprints">
      <hr>
      {{outlet}}
    </script>

    <script type="text/x-handlebars" data-template-name="sprint">
      <h4>{{name}}</h4>
      <ul>
      {{#each item in stories}}
        <li>{{#linkTo story item }}{{item.name}}{{/linkTo}}</li>
      {{/each}}
      </ul>
      {{outlet}}
    </script>

    <script type="text/x-handlebars" data-template-name="stories">
      <hr>
      {{outlet}}
    </script>

    <script type="text/x-handlebars" data-template-name="story">
      <h4>{{name}}
      <ul>
      {{#each item in tasks}}
        <li>{{#linkTo task item }}{{item.name}}{{/linkTo}}</li>
      {{/each}}
      </ul>
      {{outlet}}
    </script>

    <script type="text/x-handlebars" data-template-name="tasks">
      <hr>
      {{outlet}}
    </script>

    <script type="text/x-handlebars" data-template-name="task">
      {{#linkTo projects}}projects{{/linkTo}}/
      {{#linkTo project}}{{story.sprint.project.name}}{{/linkTo}}/
      {{#linkTo sprints}}sprints{{/linkTo}}/
      {{#linkTo sprint}}{{story.sprint.name}}{{/linkTo}}/
      {{#linkTo stories}}stories{{/linkTo}}/
      {{#linkTo story story}}{{story.name}}{{/linkTo}}/
      {{#linkTo tasks}}Tasks{{/linkTo}}
      <ul>
        <li>{{name}}</li>
      </ul>
      {{outlet}}
    </script>

model.js

var attr = Ember.attr, hasMany = Ember.hasMany, belongsTo = Ember.belongsTo;
var apiPrefix = '/api';

App.Person = Ember.Model.extend({
  id: attr(),
  name: attr(),
  members: hasMany('App.Member', {key: 'members', embedded: true})
});

App.Person.url = apiPrefix + "/persons";
App.Person.adapter = Ember.RESTAdapter.create();

App.Project = Ember.Model.extend({
  id: attr(),
  name: attr(),
  updates: attr(),
  members: hasMany('App.Member', {key: 'members', embedded: true}),
  sprints: hasMany('App.Member', {key: 'sprints', embedded: true})
});

App.Project.url = apiPrefix + "/projects";
App.Project.collectionKey = 'objects';
// App.Project.rootKey = 'story';
App.Project.camelizeKeys = true;
App.Project.adapter = Ember.RESTAdapter.create();

App.Sprint = Ember.Model.extend({
  id: attr(),
  name: attr(),
  project: belongsTo('App.Project', {key: 'project_id'}),
  stories: hasMany('App.Story', {key: 'stories', embedded: true})
});

App.Sprint.url = apiPrefix + "/sprints";
App.Sprint.collectionKey = 'objects';
App.Sprint.adapter = Ember.RESTAdapter.create();

App.Story = Ember.Model.extend({
  id: attr(),
  name: attr(),
  sprint: belongsTo('App.Sprint', {key: 'sprint_id'}),
  tasks: hasMany('App.Task', {key: 'tasks', embedded: true})
});

App.Story.url = apiPrefix + "/stories";
App.Story.rootKey = 'story';
App.Story.collectionKey = 'objects';
App.Story.adapter = Ember.RESTAdapter.create();

App.Task = Ember.Model.extend({
  id: attr(),
  name: attr(),
  Story: belongsTo('App.Story', {key: 'story_id'})
});

App.Task.url = apiPrefix + "/tasks";
App.Task.collectionKey = 'objects';
App.Task.adapter = Ember.RESTAdapter.create();

projects.json

          "updated": null,
          "created": null,
          "is_active": null,
          "person_id": "1",
          "project_id": "c97eadb1",
          "id": "kcb896f5"
        }
      ],
      "id": "c97eadb1",
      "desc": null
    }
  ],
  "num_results": 4,
  "page": 1
}