/**
* Filter the query by a related Product object
*
* @param Product|PropelObjectCollection $product the related object to use as filter
* @param string $comparison Operator to use for the column comparison, defaults to Criteria::EQUAL
*
* @return PrincipalQuery The current query, for fluid interface
* @throws PropelException - if the provided filter is invalid.
*/
public function filterByProduct($product, $comparison = null)
{
if ($product instanceof Product) {
return $this->addUsingAlias(PrincipalPeer::ID, $product->getPrincipalId(), $comparison);
} elseif ($product instanceof PropelObjectCollection) {
return $this->useProductQuery()->filterByPrimaryKeys($product->getPrimaryKeys())->endUse();
} else {
throw new PropelException('filterByProduct() only accepts arguments of type Product or PropelCollection');
}
}
