New Twiddle

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

controllers.policies\.js

import Controller from '@ember/controller';

export default class PoliciesController extends Controller {
  get policyTypes() {
    let policyTypes = this.model.policies.map((policy) => policy.type);
    
    return [...new Set(policyTypes)];
  }  
} 

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('policies', function() {
    this.route('type', { path: ':policyType' }, function() {
      this.route('target-group');
    });
  });
  this.route('policy', { path: 'policies/:id' });
});

export default Router;

routes.index\.js

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

export default Route.extend({
  redirect() {
    this.transitionTo('policies');
  }
});

routes.policies.index\.js

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

export default class PoliciesIndexRoute extends Route {
  redirect() {
    let { policies } = this.modelFor('policies');
    console.log({ policies });
    this.transitionTo('policies.type', policies[0].type);
  }
}

routes.policies.type\.js

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

export default Route.extend({
  model({ policyType }) {
    let { policies: allPolicies } = this.modelFor('policies');
    let policies = allPolicies.filter((policy) => policy.type === policyType);
    
    return {
      policyType,
      policies,
    }
  }
});

routes.policies\.js

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

const DATA = [
  { id: 1, name: 'Policy 1', type: 'mobile' },
  { id: 2, name: 'Policy 2', type: 'mobile' },
  { id: 3, name: 'Policy 3', type: 'fim' },
  { id: 4, name: 'Policy 4', type: 'fim' },
  { id: 5, name: 'Policy 5', type: 'mobile' },
];

export default class PoliciesRoute extends Route {
  model() {
    return {
      policies: DATA,
    }
  }
}

routes.policy\.js

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

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

templates.application\.hbs

<link href="https://unpkg.com/tailwindcss@^2/dist/tailwind.min.css" rel="stylesheet">

{{outlet}}

templates.policies.type\.hbs

<h2 class="text-2xl">
  Policy type: {{@model.policyType}}
</h2>

{{#each @model.policies as |policy|}}
  <p>{{policy.name}}</p>
{{/each}}

templates.policies\.hbs

<h1 class="text-3xl">
  Policies
</h1>

<div class="mb-4">
  <div class="border-b border-gray-200">
    <nav class="-mb-px flex space-x-8" aria-label="Tabs">
      {{#each this.policyTypes as |policyType|}}
        <LinkTo
          @route="policies.type"
          @model={{policyType}}
          class="border-transparent text-indigo-600 whitespace-nowrap py-4 px-1 border-b-2 font-medium text-sm"
        >
          {{policyType}}
        </LinkTo>
      {{/each}}
    </nav>
  </div>
</div>

{{outlet}}

templates.policy\.hbs

<h1 class=">
  {{@model.policy.name}}
</h1>

{{@model.policy.name}}

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": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}