How do I DRY up this common ember data loader?

@davegoulash wrote:

I often find myself doing sth like this:

  this.controllerFor('application').incrementProperty('saving');
  someModel.save().finally(() => {
    this.controllerFor('application').decrementProperty('saving');
  });

If saving > 0 I can show some kind of loading.. / saving... element.

In non ember apps I often used some global before and after callbacks (can't remember the exact details). What's the best way to tap into sth similar from Ember?

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