/**
* This model requires that a BeerConsumer be persisted prior to assigning him/her a telephone
* number. This is because the BeerConsumer id is part of the composite primary key, and that key
* is needed for the map that holds the telephone numbers.
*/
public void addTelephoneNumber(TelephoneNumber telephoneNumber) {
telephoneNumber.setBeerConsumer(this);
telephoneNumbers.put(telephoneNumber.buildPK(), telephoneNumber);
}
