Ember.js JSON API confusion

I am currently trying to create a simple Ember Application with Ember version 2.2.0 and Ember Data 2.2.1. I created my REST API to follow JSON API spec v1.0, this is an example of a resource array retrieved with GET /articles

{
  "data" : [
    {
      "id" : "5666157634499515eb7e13f0",
      "type" : "articles",
      "attributes" : {
        "title" : "test"
      }
    },
    {
      "id" : "5666157634499515eb7e13f1",
      "type" : "articles",
      "attributes" : {
        "title" : "test2"
      }
    },
    ...
  ]
}

and my articles route looks like this:

// routes/articles.js
...
export default Ember.Route.extend({
  model() {
    return this.store.findAll('article');
  }
});

and the model:

// models/article.js
...
export default DS.Model.extend({
  title: DS.attr(),
  text: DS.attr(),
  url: DS.attr(),
  date: DS.attr()
});

I followed the tutorial (http://ift.tt/1O9iPwG) exactly. Yet when I open the view, I get a warning:

WARNING: Encountered "data" in payload, but no model was found for model name "datum" (resolved model name using test-app@serializer:-rest:.modelNameFromPayloadKey("data"))

and no data is rendered. I can see the data being requested and returned correctly, but it is interpreted in the wrong way somehow.

My question is: what is wrong? I tried to stick to the default API to not write any adapters or serializers, but it is not working.