modelFor return undefined, in deactivate route event

[rakesh5208]

I have an ember app, and here is the routing for messages

this.route('messages', function() {
   this.route('list');
   this.route('new');
   this.route('edit');
});

in the messages.list route, while deactivating the route, following code snippet is running,

discardFilter: on('deactivate', function() {
    let model = this.modelFor('messages.list');
    set(model, 'filterUnstable', false);
  }),
model() {
    return RSVP.hash({
      contacts: get(this, 'store').findAll('message'),
      filterUnstable: true
    });
  }

here, on discardFilter, this.modelFor('messages.list'); return the object from model hook.

the same app, i am converting the messages to the engines, in the host app, mounting the route as
this.mount('message-engine', {as: "messages"});,
and inside the engines building the route as following:

export default buildRoutes(function() {
    this.route('list');
    this.route('new');
    this.route('edit');
});

and inside the routes/list, while deactivating the routes, the same code snippet return undefined, below is the code snippet,

discardFilter: on('deactivate', function() {
    **let model = this.modelFor('list');** // _return undefined here_
    set(model, 'filterUnstable', false);
  }),
  model() {
    return RSVP.hash({
      messages: get(this, 'store').findAll('message'),
      filterUnstable: true
    });
  }

Node and ember version

node: 8.16.0,
npm: 6.4.1,
ember-cli: 2.15.1,
ember-data: 2.15.4

[rakesh5208]

while debugging, i have found inside the message engines Ember.getOwner(this).lookup("route:messages.list") return undefined, while Ember.getOwner(this).lookup("route:list") return the router instance object.

modeFor in the route.js, have same prefixed with the mounting path name, cause the lookup instance to return undefined.

[ezy]

See emberjs/ember.js#17419 for related info