/**
* Filter the query by a related \Books object
*
* @param \Books|ObjectCollection $books the related object to use as filter
* @param string $comparison Operator to use for the column comparison, defaults to Criteria::EQUAL
*
* @return ChildUsersQuery The current query, for fluid interface
*/
public function filterByBooks($books, $comparison = null)
{
if ($books instanceof \Books) {
return $this->addUsingAlias(UsersTableMap::COL_ID, $books->getUserSys(), $comparison);
} elseif ($books instanceof ObjectCollection) {
return $this->useBooksQuery()->filterByPrimaryKeys($books->getPrimaryKeys())->endUse();
} else {
throw new PropelException('filterByBooks() only accepts arguments of type \\Books or Collection');
}
}
