/**
* Filter the query by a related \Author object
*
* @param \Author|ObjectCollection $author The related object(s) to use as filter
* @param string $comparison Operator to use for the column comparison, defaults to Criteria::EQUAL
*
* @throws \Propel\Runtime\Exception\PropelException
*
* @return ChildBookQuery The current query, for fluid interface
*/
public function filterByAuthor($author, $comparison = null)
{
if ($author instanceof \Author) {
return $this->addUsingAlias(BookTableMap::COL_AUTHOR_ID, $author->getId(), $comparison);
} elseif ($author instanceof ObjectCollection) {
if (null === $comparison) {
$comparison = Criteria::IN;
}
return $this->addUsingAlias(BookTableMap::COL_AUTHOR_ID, $author->toKeyValue('PrimaryKey', 'Id'), $comparison);
} else {
throw new PropelException('filterByAuthor() only accepts arguments of type \\Author or Collection');
}
}
