This is my Model Mixing implementation:

    import Ember from 'ember';

    export default Ember.Mixin.create({
      isReloadingDidChange: Ember.observer('isReloading', function() {
        console.log('XXX3: isReloadingDidChange', this.get('kind'), this.get('id'), this.get('isReloading'));
      }),

      isSavingDidChange: Ember.observer('isSaving', function() {
        console.log('XXX3: isSavingDidChange', this.get('kind'), this.get('id'), this.get('isSaving'));
      }),

      isLoadingDidChange: Ember.observer('isLoading', function() {
        console.log('XXX3: isLoadingDidChange', this.get('kind'), this.get('id'), this.get('isLoading'));
      }),

      isLoadedDidChange: Ember.observer('isLoaded', function() {
        console.log('XXX3: isLoadedDidChange', this.get('kind'), this.get('id'), this.get('isLoaded'));
      }),

      isEmptyDidChange: Ember.observer('isEmpty', function() {
        console.log('XXX3: isEmptyDidChange', this.get('kind'), this.get('id'), this.get('isEmpty'));
      }),

      onInit: Ember.on('init', function() {
        console.log('XXX3: onInit', this.get('kind'), this.get('id'));
        this.getProperties('isReloading', 'isSaving', 'isLoading', 'isLoaded');
      }),

      onDidLoad: Ember.on('didLoad', function() {
        console.log('XXX3: onDidLoad', this.get('kind'), this.get('id'));
      }),

      onReady: Ember.on('ready', function() {
        console.log('XXX3: onReady', this.get('kind'), this.get('id'));
      }),
    });


These are the events trigered with the object is instantiated by DS store:

    isSavingDidChange isSaving == false
    isLoadingDidChange isLoading == true
    isLoadedDidChange isLoaded == false
    isSavingDidChange isSaving == false
    isLoadingDidChange isLoading == false
    isLoadedDidChange isLoaded == true
    onDidLoad
    onReady

These are the events trigered on `save()`:

$E.save()
    isSavingDidChange isSaving ==  true
    isLoadingDidChange isLoading == false
    isLoadedDidChange isLoaded ==  true
    isEmptyDidChange isEmpty == false
    isSavingDidChange isSaving == false
    isLoadingDidChange isLoading == false
    isLoadedDidChange isLoaded ==  true
    isEmptyDidChange isEmpty == false