Ember data JSON Api adapter set all attributes to undefined

In an application using ember 2.1.0 and ember-data 2.1.0, I have this model :

# app/models/user.js
import DS from 'ember-data';

export default DS.Model.extend({
  name: DS.attr()
});

And this route :

# app/routes/subscriptions/new.js
export default Ember.Route.extend({
  model() {
    this.store.findRecord('user', 1).then(function(data) {
      console.log(data.id)
      console.log(data.get('email'))
    })
    return this.store.find('user', 1);
  }
});

I have this adapter :

import DS from 'ember-data';

export default DS.JSONAPIAdapter.extend({host: 'http://localhost:5000'})

This data is returned by the server :

{"data":{"id":"1","type":"users","attributes":{"email":"test@test.com"}}}

In the console, I have the user id but the email is undefined. In the template, {{model.email}} gives nothing.

I may miss something but it's so simple. Is it my mistake or a bug?