Loading routes in routable engine don't work

Loading subroutes are not working for me in a routeable engine.

My setup: ember@2.8.0 ember-engines@0.3.0 ember-cli@2.7.0

My engine is setup as an in-repo routeable engine. Basically, it seems that all loading subroutes simply aren’t ever entered. Instead, it always falls back to the host apps loading routes.

Steps to reproduce:

ember g route test-subroutes -ir=my-engine
ember g route test-subroutes-loading -ir=my-engine
ember g route loading -ir=my-engine

// lib/my-engine/addon/test-subroutes/route.js

beforeModel() {
  return new Ember.RSVP.Promise((resolve) => {
    Ember.run.later(this, resolve, 5000);
  });
}

{{! lib/my-engine/addon/loading/template.hbs}}
{{! & lib/my-engine/addon/test-subroutes-loading/template.hbs }}

{{log 'engine loading'}}

Basically, the log from the loading templates is never reached. Instead, when looking at the Ember Inspector, I see that while loading, the current route is application.loading.

My host-apps router:

Router.map(function() {
  this.mount('my-engine', { as: 'my-engine' });
});

My engines router:

export default buildRoutes(function() {
  this.route('test-subroutes');
});

( I left out other routes from my app, but I don’t think they should have any impact on this?)

[mydea]

This is great! I’m running ember beta & ember-engines 0.4.2 and it’s working perfectly. Thanks for that, that was the only remaining major pain point with engines for us.

[trentmwillis]

This should be fixed once https://github.com/dgeb/ember-engines/pull/246 and https://github.com/emberjs/ember.js/pull/14545 land. This was honestly, stupidly hard to fix lol.