How to Create A Multidimensional Record in Ember

I'm relatively new with Ember.

I'm trying to save a multidimensional record so that I can easily have observables set to appropriately populate some select menus.

I've tried using square brackets, circle brackets, and dot notation to try to save the record, but I can't figure out how to set it up properly.

Here's what I was trying

import Ember from 'ember';

export default Ember.ObjectController.extend({
  actions: {
    publishCity: function() {
      var newCity = this.store.createRecord('city', {
         model.country: this.get('country'),
         model.province: this.get('province'),
         model.city : this.get('city'),
      });
      newCity.save();
    }
  }
});