Related/linked entities don't load properly

With two models related in a 1:1 fashion:

Person:

lead: DS.belongsTo('lead', { async: true }),
firstName: DS.attr('string'),
lastName: DS.attr('string'),
photo_url: DS.attr('string'),

Lead:

person: DS.belongsTo('person', { async: true }),
username: DS.attr('string'),

I'm receiving the following JSON from my web service:

{
    "leads": [
        {
            "id": 13,
            "person_id": 56,
            "username": "joe@gmail.com"
            "type": "leads"
            "href": "/leads/13",
            "links": {
                "person": 56
            },
        },
        {
            "id": 14,
            "person_id": 57,
            "username": "joe2@gmail.com"
            "type": "leads"
            "href": "/leads/14",
            "links": {
                "person": 57
            },
        },
    ],
    "linked": {
        "person": [
            {
                "id": 56,
                "first_name": "Emily",
                "last_name": "Dougals",
                "gender": "Female",
                "type": "peoples",
                "href": "/people/56",
            },
            {
                "id": 57,
                "first_name": "Joe",
                "last_name": "Ingersoll",
                "gender": "Male",
                "type": "peoples",
                "href": "/people/57",
            },
        ]
    },
    "links": {
        "leads.person": {
            "href": "/people/{person.person_id}",
            "type": "peoples"
        }
    }
}

All four objects are being loaded as expected into their respective models, as seen in the Ember Inspector. However, the warning WARNING: The payload for 'people@model:lead:' contains these unknown keys: [href,person_id,peoples] is received, and the objects are not acting like they are linked. In other words, I'm able to access 'lead.username' in my templates, but not 'lead.person.firstName' or any other field on the person object.

When I convert my web service response and use the standard ActiveModel Adapter/Serializer in Ember it functions as expected.

I'm happy to provide more information as needed. Thank you.

kurko / ember-json-api

Related/linked entities don't load properly #62