JavaScript EmberJS: is it possible to save only modified objects?

I have a small and quite standard application that:

Fetches objects from the server
Renders the objects and allows some editing on them. If it is important, this editing only affects DS.hasMany attributes.
Offers a saving back to the server (it should not happen automatically, only on user request)

The app controller handles a save event, and there I store the stuff. The code looks like this:

import Ember from 'ember';

export default Ember.Controller.extend({
    actions: {
        save() {
            this.store.peekAll('object').forEach(obj => {
                obj.save();
            });
        }
    }
});

This issues a PUT request for each object locally loaded. It works fine, but it is a little bit of brute force. Instead, I would like to save only the modified objects.

I have tried with dirtyType, but it returns undefined inside of the .forEach, and also hasDirtyAttributes, but it returns false always.

I could build my own cache of modified objects, but that would be a lot of work and error prone. Is there any standard way of handling this situation? thanks in advance.

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