Route Computed Props

controllers.application.js

import Ember from 'ember';

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

controllers.my-route.edit.js

import Ember from 'ember';

export default Ember.Controller.extend({
  actions: {
    changeState() {
      this.set('model.state', 'new');
    },
  },
});

controllers.my-route.index.js

import Ember from 'ember';
import { computed } from '@ember/object';

export default Ember.Controller.extend({
});

models.container.js

import Model from 'ember-data/model';
import attr from 'ember-data/attr';
import { belongsTo, hasMany } from 'ember-data/relationships';

export default Model.extend({
  title: attr('string'),
  
  objs: hasMany(),
});

models.obj.js

import Model from 'ember-data/model';
import attr from 'ember-data/attr';
import { belongsTo, hasMany } from 'ember-data/relationships';

export default Model.extend({
  val: attr('string'),
  
  container: belongsTo(),
});

router.js

import EmberRouter from '@ember/routing/router';
import config from './config/environment';

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

Router.map(function() {
  this.route('my-route', { path: '/' }, function() {
    this.route('index', { path: '/' });
    this.route('edit', { path: ':obj_id' });
  });
});

export default Router;

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
	  const container = this.store.createRecord('container', {
      id: 1,
      title: 'heading thing',
    });
    
    this.store.createRecord('obj', {
      id: 1,
      val: 'initial',
      container,
    });
    
    this.store.createRecord('obj', {
      id: 2,
      val: 'initial',
      container,
    });
    
    this.store.createRecord('obj', {
      id: 3,
      val: 'initial',
      container,
    });
  },
});

routes.my-route.edit.js

import Ember from 'ember';

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

routes.my-route.index.js

import Ember from 'ember';
import { A } from '@ember/array';
import EmberObject from '@ember/object';

export default Ember.Route.extend({
  model() {
    return this.store.peekRecord('container', 1);
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
{{outlet}}

templates.my-route.edit.hbs

I'm the edit route!
{{#link-to 'my-route.index'}}
  Nav Back
{{/link-to}}
<br><br>

<div>
  <input value={{model.val}}>
</div>

templates.my-route.index.hbs

Hello, I'm the index
<br><br>

Container Title: "{{model.title}}"
{{#each model.objs as |obj|}}
  <div>
    {{#link-to 'my-route.edit' obj}}
      {{obj.id}} - {{obj.val}}
    {{/link-to}}
  </div>
{{/each}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.1.4",
    "ember-template-compiler": "3.1.4",
    "ember-testing": "3.1.4"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}