Sorting a nested array from model in Ember?

So I have a model in Ember that is generating a hash with three objects. One of the objects is an array of objects with another array inside each object. I need to sort this innermost array, but I am having trouble doing so.

Here are my models.

App.Person = DS.Model.extend ({
    first_name: DS.attr('string'),
    last_name: DS.attr('string'),
    age: DS.attr('string'),
    gender: DS.attr('string'),
    innerMostArray: DS.hasMany('innerMostObject')
});

App.innerMostObject = DS.Model.extend ({
    person_id: DS.belongsTo('person'),
    attr1: DS.attr('string'),
    attr2: DS.attr('string')
});

Here is my Route

App.NestedArrayRoute = Ember.Route.extend({
    model: function(params) {
        return Ember.RSVP.hash({
            object1: this.store.find('object1', params.object1_id),
            people: this.store.all('person'),
            object3: this.store.all('object3')
        });
    },
    afterModel: function(model, transition) {
        model.people.forEach(function(item, index, enumerable){
            var innerMostArray = item.get('innerMostArray');
            var sortedArray = innerMostArray.sortBy('attr1', 'attr2');
        });
        model.people.update();
    } 
});

I know that I am nowhere near doing this right but I just don't know how to sort this nested array. I've seen examples of array controllers, but I don't know how to use one to sort this nested array. If anyone could give an example of how to do this it would be very helpful. Thank you.