emberjs/data — comment on commit 3843029c69d835d247d8182a4d5645f5acedcb7e
File: packages/ember-data/lib/system/model/model.js line 269
By pangratz:

I also stumbled upon this today and I looked at the tests and found the issue: if you want to include the associations you have to do a `model.toJSON({associations: true})`...

But I'm still questioning myself why this isn't used by default.