Ember data in select box

I have a user CRUD, with a shared controller between users/new and users/edit.

Can someone show me the best way to populate a select box with ember data?

I have a department select box. I have a mirage fixture for departments, along with users. I'm also using power select addon for the select box.

I managed to get the department model set via setupController, but this doesn't seem like the best option?