New Twiddle

components.my-component.js

import Ember from 'ember';
import CRUD from '../mixins/crud';

const { computed } = Ember;

export default Ember.Component.extend(CRUD, {
  
  validations: computed(function() {
  	this._super(); // this is actually pointing to CRUD.actions.save instead of parent.validations
    return {};
  }),
  
  init() {
  	this._super(...arguments);
    this.set('emitted', []);
  },
  
  actions: {
    save() {
      // Get validations object which calls _super.
      // _super should return the parent validation 
      // object but instead it calls the save action in 
      // the CRUD mixin
      const validations = this.get('validations');
      this.emitted.pushObject('[my-component] save');
      this._super(...arguments);
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

mixins.crud.js

export default Ember.Mixin.create({
  actions: {
    save(){
      this.emitted.pushObject('[crud mixin] save');
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{my-component}}
<br>
<br>

templates.components.my-component.hbs

<button {{action 'save'}}>Save</button>

{{emitted}}
{{#each emitted as |e|}}
	<p>{{e}}</p>
{{/each}}

twiddle.json

{
  "version": "0.7.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.3/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.3/ember-template-compiler.js"
  }
}