As you can see here http://jsfiddle.net/kt2Hz/ I was expecting the dynamic segment from parent routing resource to be available for the nested routes and resources.
It was not.
So I had to retrieve the model by using this.modelFor(‘parent_resource’) in the current route’s model hook.
It seems to me that it would be better, if it was available in params for the current route. It would make more sense (to me) and the routes wouldn’t have to depend on others model hooks.
It would also be easier to work with multiple dynamic segments from parent routes and current route, if they were all available to the current route’s model hook (in the params argument).