Calling a relationship in template returns a DS.PromiseObject

I'm using firebase in combination with Ember CLI. I have the following setup:

ember.debug.js:6401 DEBUG: Ember      : 2.4.5
ember.debug.js:6401 DEBUG: Ember Data : 2.5.1
ember.debug.js:6401 DEBUG: Firebase   : 2.4.2
ember.debug.js:6401 DEBUG: EmberFire  : 1.6.6
ember.debug.js:6401 DEBUG: jQuery     : 2.2.3

I have two simple modules

<!-- app/modules/user.js -->
import Model from 'ember-data/model';

export default Model.extend({
  firstName: DS.attr('string'),
  lastName: DS.attr('string'),
  email: DS.attr('string'),
  profile: DS.belongsTo('profile', {async: true})
});

And a second module for my profile

<!-- app/modules/profile.js -->
import Model from 'ember-data/model';

export default Model.extend({
  companyName: DS.attr('string'),
  user: DS.belongsTo('user', {async: true})
});

I have the following profile route:

<!-- app/routes/profile.js -->
import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return this.store.query('user', { orderBy: 'email', equalTo: this.get('session.currentUser.email')}).then(function(user){
      console.log(user);
      return user;
    });
  }
});

I check if the current session email address is equalTo a email address in the database. And return the user objet. This is working. (don't know if this is the right way to do this?)

In my profile handlebars template i have the following code.

<!-- app/templates/profile.hbs -->
{{#each model as |user|}}
  {{user.firstName}}
  {{user.lastName}}
  {{user.profile}}
{{/each}}

This returns the following on screen:

frank spin <DS.PromiseObject:ember545>

My guess is that the relationship data has not yet been received. I don't know how to solve this issue. And second question: Is my checking for the current logged in user the right way?