Ember-data error: "Assertion Failed: You need to pass a model name to the store's modelFor method" - ember.js

Question

I'm getting this error when trying to consume the json from the backend.
I'm using Ember CLI version 2.5.0 and the RestAdapter.
Here's my routes/products/index.js looks like:
export default Ember.Route.extend({
actions: {
[...]
},
model: function() {
return this.store.findAll('product');
}
});
And here's what my json looks like:
{
"products":[
{
"id":9,
"name":"Product A",
"price_cents":1500,
"margin_cents":0,
"commission":0,
"expiration":null,
"track_stock":false,
"stock_amount":5,
"brand":{
"id":2,
"name":"SuperPet"
},
"group":{
"id":1,
"name":"Group A"
}
},
{
"id":8,
"name":"Product B",
"price_cents":1500,
"margin_cents":0,
"commission":0,
"expiration":null,
"track_stock":false,
"stock_amount":5,
"brand":{
"id":1,
"name":"Whiskas"
},
"group":{
"id":1,
"name":"Group B"
}
}
],
"meta":{
"pagination":{
"per_page":null,
"total_pages":4,
"total_objects":10
}
}
}
And by request, here's the model:
import DS from 'ember-data';
const { attr, belongsTo } = DS;
export default DS.Model.extend({
name: attr('string'),
priceCents: attr('number'),
marginCents: attr('number'),
comission: attr('number'),
expiration: attr('date'),
trackStock: attr('boolean'),
stockAmount: attr('number'),
brand: belongsTo('brand')
});

Answer 1

I was having the same issue. This worked for me:
//app/serializers/product.js
import DS from 'ember-data';
import Ember from 'ember';
export default DS.RESTSerializer.extend(DS.EmbeddedRecordsMixin,{
attrs: {
brand: { embedded: 'always' },
group: { embedded: 'always'}
}
});

Answer 2

You have the brand: belongsTo('brand')
but you forgot the group: belongsTo('group')
also .. these two ( brand, group ) have to be declared as embedded with the DS.EmbeddedRecordsMixin in the product serializer if you are going to embed them this way