Force transition to loading state during setupController

I’m refreshing my model in my show route, and want to briefly show the loading substate whilst this async behaviour is happening as the screen can take a while to update with the fresh data.

Here’s my setupController function:

 setupController: function(controller,model){
    var self = this;

The loading route is entered, but then gets stuck in that loading route forever. How do I transition out of the loading route and back into the route.