QueryParams Demo

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'QueryParams Demo',
  referrerLocation: null,
  queryParams: ['referrerLocation']
});

router.js

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

const Router = Ember.Router.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('home', { path: '/' });
  
  this.route('product', { path: 'product/:productId' });
});

export default Router;

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  queryParams: {
    referrerLocation: {
    	replace: true,
      refreshModel: false
    }
  }
});

routes.home.js

import Ember from 'ember';

export const FRUITS = {
  apple: 'https://cdn.iconscout.com/public/images/icon/free/png-256/apple-fruit-food-vitamin-healthy-30aba8081bb38594-256x256.png',
  orange: 'https://cdn1.iconfinder.com/data/icons/fruits-vegetables-16/512/22_Citrus_food_fruit_orange-256.png',
  banana:  'https://images.vexels.com/media/users/3/143061/isolated/lists/aaf71ed4e387a6838e1c521fbecde77a-banana-icon-fruit.png'
};

export default Ember.Route.extend({
  model() {
    return FRUITS;
  }
});

routes.product.js

import Ember from 'ember';
import { FRUITS } from './home';

export default Ember.Route.extend({
  model({ productId }) {
    return FRUITS[productId];
  }
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

.lolog img {
  width: 125px;
  border: 3px dotted blue;
}

templates.application.hbs

<h1>Welcome to {{appName}} - referrerLocation: {{referrerLocation}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

<h3>References</h3>

<ul>
	<li>
  	<a href='https://emberjs.com/api/ember/3.1/functions/@ember%2Fcontroller/inject'>
    	controller injects only works in controllers
    </a>
  </li>
  <li>
  	<a href='https://github.com/offirgolan/ember-parachute'>
    	ember parachute (community addon for less bad qp handling)
    </a>
  </li>
</ul>

templates.home.hbs

<h2>List of List of Fruits</h2>

<p>
The point of this twiddle is to demostrate that you <strong>need</strong> to specify query-params on all links if you specify it on one link
</p>

<h3>
  Common Fruits
</h3>
<div class='lolog'>
	{{#each-in model as |key src|}}
  	{{#link-to 'product' key (query-params referrerLocation=key)}}
    	<img src={{src}}>
    {{/link-to}}
  {{/each-in}}
</div>

templates.product.hbs

<h2>Fruit Details</h2>

<img src={{model}}>

<ul>
	<li>
    {{#link-to 'home'}}
      Home without referrerLocation
    {{/link-to}}  
  </li>
  <li>
    {{#link-to 'home' (query-params referrerLocation='product')}}
      Home with referrerLocation
    {{/link-to}}
  </li>
</ul>

twiddle.json

{
  "version": "0.13.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}