New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  queryParams: [
    { postalCode: 'postal_code' }
  ],
  postalCode: null,
  
  init() {
    Ember.run.later(this, function() {
      this.set('postalCode', '55555');
    }, 1000);
  }
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  queryParams: {
    postalCode: {
      as: 'postal_code',
      refreshModel: true
    }
  },
  model(params) {
    return params;
  }
});

templates.application.hbs

{{#each-in model as |param value|}}
	{{param}}: {{value}}
{{/each-in}}

twiddle.json

{
  "version": "0.10.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.7.0",
    "ember-data": "2.7.0",
    "ember-template-compiler": "2.7.0"
  },
  "addons": {}
}