paramsFor Child

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  value: {
    id: 12,
    name: 'james'
  }
});

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('parent', function() {
    this.route('child', { path: '/child/:child_id' });
  });
});

export default Router;

routes.parent.child.js

import Ember from 'ember';

export default Ember.Route.extend({
  model(params) {
    return  {
	    id: 12,
  	  name: 'james'
	  };
  }
});

routes.parent.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return this.paramsFor('parent.child');
  }
});

templates.application.hbs

<h1>Application</h1>
{{#link-to 'parent.child' 12}}parent.child{{/link-to}}

<hr />
{{outlet}}

templates.parent.child.hbs

<h3>Child</h3>

{{model.name}}

templates.parent.hbs

<h2>Parent</h2>
{{model.child_id}}

<hr />
{{outlet}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}