/**
  * Override of UcAddressesSchemaAddress::getField().
  *
  * Getting some of the schema fields differently.
  *
  * @param string $fieldName
  *	 The name of the field whose value we want.
  *
  * @access public
  * @return mixed
  *	 The field value.
  * @throws UcAddressInvalidFieldException
  */
 public function getField($fieldName)
 {
     switch ($fieldName) {
         case 'aid':
             return $this->getId();
         case 'uid':
             return $this->getUserId();
     }
     return parent::getField($fieldName);
 }