routes example

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
}

models.task\.js

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

export const schema = {
  // Attributes
	name: attr('string')

  // Associations

  // Computed Properties

};

export default Model.extend(schema);

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('restricted-tasks', function() {
    this.route('show', { path: '/:task_id' });
  });
});

export default Router;

routes.restricted-tasks.index\.js

import Route from '@ember/routing/route';

export default Route.extend({
  model() {
  	return [{
    	id: '1',
      name: 'Task One'
    }, {
    	id: '2',
      name: 'Task Two'
    }];
  }
});

routes.restricted-tasks.show\.js

import Route from '@ember/routing/route';

export default Route.extend({
  model({ task_id }) {
  	// stubbed task
    return {
    	id: '1',
      name: 'Task One'
    }
  }
});

templates.application\.hbs

<h1>Test Routes</h1>

{{#link-to "restricted-tasks"}}Restricted Tasks{{/link-to}}

{{outlet}}

templates.restricted-tasks.index\.hbs

<h1>Restricted Tasks (index)</h1>

{{#each model as |task|}}
	{{!-- if you pass `task` (model) instead of `task.id` then `/restricted-tasks/show` won't invoke the model hook.  Generally we want to do invoke... --}}
	<div>{{link-to task.name "restricted-tasks.show" task.id}}</div>
{{/each}}

templates.restricted-tasks.show\.hbs

<h1>Restricted Task</h1>

<div>{{model.name}}</div>

<div>stubbing the model here, but you should see the URL with the task_id.  Check the router to see this path structure i.e. { path: '/:task_id' }.  You could do { path: '/:task_id/show' } for example</div>

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "2.18.2",
    "ember-template-compiler": "2.18.2",
    "ember-testing": "2.18.2"
  },
  "addons": {
    "@glimmer/component": "1.0.0",
    "ember-data": "2.18.5"
  }
}