emberdata.js

//store-todo.js
import DS from 'ember-data';

export default DS.Model.extend({
  description: DS.attr('string'),
  name: DS.attr('string'),
  storeTodoStatuses: DS.hasMany('store-todo-status')
});

//store-todo-status.js
import DS from 'ember-data';

export default DS.Model.extend({
  completed: DS.attr('boolean'),
  storeTodo: DS.belongsTo('store-todo'),
  cStore: DS.belongsTo('store')
});

response.json

{
   "data":[
      {
         "id":"1",
         "type":"store-todo-statuses",
         "links":{
            "self":"http://localhost:3000/api/v1/store-todo-statuses/1"
         },
         "attributes":{
            "completed":false
         },
         "relationships":{
            "store":{
               "links":{
                  "self":"http://localhost:3000/api/v1/store-todo-statuses/1/relationships/store",
                  "related":"http://localhost:3000/api/v1/store-todo-statuses/1/store"
               }
            },
            "store-todo":{
               "links":{
                  "self":"http://localhost:3000/api/v1/store-todo-statuses/1/relationships/store-todo",
                  "related":"http://localhost:3000/api/v1/store-todo-statuses/1/store-todo"
               },
               "data":{
                  "type":"store-todos",
                  "id":"1"
               }
            }
         }
      }
   ],
   "included":[
      {
         "id":"1",
         "type":"store-todos",
         "links":{
            "self":"http://localhost:3000/api/v1/store-todos/1"
         },
         "attributes":{
            "name":"Todo",
            "description":"Do that"
         },
         "relationships":{
            "store-todo-statuses":{
               "links":{
                  "self":"http://localhost:3000/api/v1/store-todos/1/relationships/store-todo-statuses",
                  "related":"http://localhost:3000/api/v1/store-todos/1/store-todo-statuses"
               }
            }
         }
      }
   ]
}