weird analytics in the routes

controllers.application.js

import Ember from 'ember';
import {inject} from '@ember/service';

export default Ember.Controller.extend({
  routerService: inject('router'),
  analytics: inject('analytics'),
  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('route1', {path: '/route1/:id'});
  this.route('route2', {path: '/route2/:id'});
});

export default Router;

routes.application.js

import Ember from 'ember';
import { inject } from '@ember/service';
import { getOwner } from '@ember/application';

export default Ember.Route.extend({
  routerService: inject('router'),
  analytics: inject('analytics'),
  init() {
    this._super(...arguments);
    this.routerService.on('routeDidChange', (transition) => {
      console.log('currentRoute', this.routerService.currentRoute);

    if (!this.routerService.currentRoute) return;
        const currentRoute = getOwner(this).lookup(`route:${this.routerService.currentRouteName}`);
    console.log('currentRoute', currentRoute);
    let eventName;
    if (typeof currentRoute.analyticsEventName === 'function') {
      eventName = currentRoute.analyticsEventName(currentRoute.currentModel, transition.to.params); 
    } else if (typeof currentRoute.analyticsEventName === 'string') {
      eventName = currentRoute.analyticsEventName; 
    }
    
    if (eventName) {
      this.analytics.trackEvent(eventName); 
    }
    });
  }
});

routes.route1.js

import Ember from 'ember';

export default Ember.Route.extend({
  analyticsEventName(model, params) {
    return 'route1' + params.id 
  }
});

routes.route2.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return {
      id: 'butthead'
    }
  },
  analyticsEventName(model, params) {
    return `route2 ${model.id}` 
  }
});

services.analytics.js

import Ember from 'ember';

export default Ember.Service.extend({
  tracks: Ember.computed(function() {
    return Ember.A([]);
  }),
  trackEvent(eventName) {
    this.tracks.pushObject(eventName) 
  }
});

templates.application.hbs

<h1>Tracks</h1>

<ul>
  {{#each analytics.tracks as |track|}}
    <li>{{track}}</li>
  {{/each}}
</ul>

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

<p>Click on the links below to add an analytics event. It will render under "Tracks" above. Look at routes/route1.js and routes/route2.js to see how to define an analytics event name without having to define the analytics injection and an afterModel function. The `analyticsEventName` property can be either a function that is passed the route's model and params, or a static string</p>

{{#link-to 'route1' 1}}
  route1
{{/link-to}}
{{#link-to 'route2' 'butt'}}
  route2
{{/link-to}}
<br>
<br>
{{outlet}}
<br>
<br>

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": "3.9.0",
    "ember-template-compiler": "3.9.0"
  }
}