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