There are two parts to debugging this, the first would be to inspect the JSON payload in your browser console. (In Chrome, check the Network tab).
To check the internal data being stored in an EmberData object there are actually two places that are used for internal housekeeping object.get('_data')
and object.get('_reference')
.
In your case I think the data is what you are hoping for.
Your other options are to call object.toJSON()
or object.serialize()
to see what the representation that would be returned to the server in the current state.