Ember.JS Tutorial "Super-Rentals" and API Paths

I've been following the SuperRentals Ember.JS tutorial and have also cloned the finished product from here.

I'm struggling to identify where we define that we retrieve data from rentals.json in <app_dir>/public/api:

XXX@XXXX-XX:~/super-rentals/public/api$ ls
rentals rentals.json

If I change rentals.json to another name, the site stops loading entirely implying some configuration or code requires changing to reflect this.

However, when I grep for "rentals" recursively in <app_dir>/app none of the references returned appear related.

Is this naming picked up by convention, or is it explicitly defined somewhere in the application?