/**
* Add an amount (can be negative) to the specified field (needs to be numeric).
*
* @since 1.20
* @deprecated since 1.22, use IORMTable->addToField
*
* @param string $field
* @param integer $amount
*
* @return boolean Success indicator
*/
public function addToField($field, $amount)
{
return $this->table->addToField($this->getUpdateConditions(), $field, $amount);
}