New Twiddle

application.route.js

import Ember from 'ember';
import RecordDeletedMixin from 'demo-app/mixins/record-deleted';

export default Ember.Route.extend(RecordDeletedMixin, {
  pushClient: Ember.inject.service('push-client'),

  recordDeleted() { 
    alert("a post was deleted, but you are not on the post page so you don't care");
  },
  
  actions: {
    pretendPush() {
      this.get('pushClient').deleteRecord();
    }
  }
});

application.template.hbs

<button {{action 'pretendPush'}}>Pretend to websocket push</button>

{{link-to "Index" "index"}}
{{link-to "Post" "post" 123}}

{{outlet}}

index.template.hbs

<h2>Index Page</h2>

mixins.record-deleted.js

import Ember from "ember";

export default Ember.Mixin.create({
  activate() {
    this._super();
    this.get('pushClient').on('recordDeleted', this, this.recordDeleted);
  },

  deactivate() {
    this._super();
    this.get('pushClient').off('recordDeleted', this, this.recordDeleted);
  }
});

post.route.js

import Ember from 'ember';
import RecordDeletedMixin from 'demo-app/mixins/record-deleted';

export default Ember.Route.extend(RecordDeletedMixin, {
  pushClient: Ember.inject.service('push-client'),
  model() {
    return "a post";
  },
    recordDeleted() {
      alert('The post you were looking at was deleted. Returning to home page');
      this.transitionTo('index');
    }
});

post.template.hbs

<h2>My Great Post</h2>

router.js

import Ember from 'ember';
import config from './config/environment';

var Router = Ember.Router.extend({
  location: config.locationType
});

Router.map(function() {
  this.route('post', {path: "/posts/:post_id"});
});

export default Router;

services.push-client.js

import Ember from 'ember';

export default Ember.Service.extend(Ember.Evented, {
  router: Ember.computed(function() {
    // should be injected in an initializer, can't get intializer working in twiddle
    return this.container.lookup('router:main');
  }),
  deleteRecord() {
  	this.trigger('recordDeleted');
  }
});

twiddle.json

{
  "version": "0.4.11",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.11/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember-template-compiler.js"
  }
}