multiple relations using same model type in ember data

I have an account model that has the following:

export default Model.extend({
  primaryStaff: belongsTo('staff'),
  secondaryStaff: belongsTo('staff')
});

primaryStaff maps to the primaryStaffId key on the account model and secondaryStaff maps to secondaryStaffId. Is there a way to allow these to both point to the staff model?

Not having any luck. Thanks!