Content is undefined when trying to work with a record in Ember

I am trying to update a record in the Ember store. When I try to do this, it returns the following error:

Uncaught Error: Assertion Failed: Cannot delegate set('name', test) to the 'content' property of object proxy <DS.PromiseObject:ember1013>: its 'content' is undefined.

I have set the route and controller in the following Gist

The project is unfortunately made with Ember 1.13..