Adds an `activeRoutes` array to the Ember `Router`, along with a `routeFor` lookup method/helper

ember-active-route-initializer.js

// app/initializers/router-active-routes.js
import Ember from 'ember';

export function initialize() {


  Ember.Route.reopen({


    // Helper function for Routes to lookup other routes,
    // similar to how controllers can `controllerFor()`
    routeFor( routeName ) {

      // No route name passed? Nothing to return...
      if (!routeName) {
        return;
      }

      // Trying to get the current route, return it...
      if ( routeName === this.get('routeName') ) {
        return this;
      }

      // Lookup and return the route from the container
      const container = Ember.getOwner( this );
      return container.lookup(`route:${routeName}`);

    }, // routeFor()


    actions: {
      _collectRoute( routes ) {

        // Add the current route to the top of the stack
        routes.unshift( this );

        // Once at the "top", put the entire stack on the router
        // Else continue up the route tree
        if (this.get('routeName') === 'application') {
          this.set('router.activeRoutes', routes);
        } else {
          return true;
        }

      } // _collectRoute()
    } // :actions


  }); // Ember.Route.reopen()




  Ember.Router.reopen({

    // Temporary placeholder
    activeRoutes: [],


    // Trigger the collection action
    // on the farthest leaf Route
    didTransition() {
      this._super(...arguments);
      this.send('_collectRoute', []);
    } // didTransition()

  }); // Ember.Router.reopen()
}

export default {
  name: 'router-active-routes',
  initialize
};