pass id in route

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: "Ember Twiddle"
})

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('posts', function() {
    this.route('edit', { path: '/:post_id/edit' });
  });
});

export default Router;

routes.posts.edit.js

import Ember from 'ember';

export default Ember.Route.extend({
  model(params) {
    alert('hit this when update post is clicked. Post id is :'+params.post_id)
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#link-to "posts.edit" 3}}Update post{{/link-to}}
<br>
{{outlet}}
<br>
<br>

templates.posts.edit.hbs

Post Edit page

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": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}