Emberjs Fixtures when creating record

When creating a new record in Emberjs while working with fixtures, the new object has an id as “fixtures-#”, I think it would be nice in a newer version of ember, developers could override a function and work out their own technique for assigning an id to a new object. With the current id generated, it seems difficult to work with the newly created object. As such, working fully without a backend seems kinda impossible. I’m new to emberjs and I may be wrong !!