re-render hooks

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
    updateCount: 0,
    didUpdateAttrs() {
        this._super(...arguments)
        console.log("didUpdateAttrs", this.updateCount)
        debugger
        this.updateCount++;
    }
});

controllers.application.js

import Ember from 'ember';

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

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('item', { path: ':item_id' });
});

export default Router;

routes.item.js

import Ember from 'ember';

export default Ember.Route.extend({
    model(params) {
        console.log("model", params)
        return {
            value: "some unimportant value"
        }
    }
});

templates.application.hbs

{{#link-to "item" 1}}
  Goto 1
{{/link-to}}
{{#link-to "item" 2}}
  Goto 2
{{/link-to}}
{{outlet}}

templates.components.my-component.hbs

{{@value}}

templates.item.hbs

{{my-component value=model.value}}

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"
  }
}