Display JSON Api conform errors

I receive JSON Api conform errors from the backend:

{
  "errors": [
    {
      "status": "400",
      "source": {
        "pointer": "/data/attributes/description"
      },
      "detail": "This field may not be null."
    },
    {
      "status": "400",
      "source": {
        "pointer": "/data/attributes/due-date"
      },
      "detail": "This field may not be null."
    },
    {
      "status": "400",
      "source": {
        "pointer": "/data/attributes/extra-comments"
      },
      "detail": "This field may not be null."
    },
    {
      "status": "400",
      "source": {
        "pointer": "/data/attributes/name"
      },
      "detail": "This field may not be null."
    },
    {
      "status": "400",
      "source": {
        "pointer": "/data/attributes/payment-type"
      },
      "detail": "This field may not be null."
    },
    {
      "status": "400",
      "source": {
        "pointer": "/data/attributes/price"
      },
      "detail": "This field may not be null."
    }
  ]
}

I try to show them in my template, as described in the EmberData documentation:

{{#each model.errors.messages as |message|}}
  <div class="error">
    {{message}}
  </div>
{{/each}}

Nothing is shown. I would say the .errors in the model are not populated, but I am not sure how to check this. How can I:

• display the received ajax reply?
• make sure that EmberData is processing the reply and populating model.errors?
• Show the processed model.errors in the console?
• Show the model and all properties?

In general, I am experiencing that new versions of Ember are very hard to debug. Whenever I show any Ember object in the console, I just see some Computed properties which are not expanded whenever I try to peek into them.

My backend is:

• Django 1.9
• with django-rest-framework
• django-rest-framework-json-api