/**
  * Filter the query by a related \App\Propel\Config object
  *
  * @param \App\Propel\Config|ObjectCollection $config the related object to use as filter
  * @param string $comparison Operator to use for the column comparison, defaults to Criteria::EQUAL
  *
  * @return ChildConfigCategoryQuery The current query, for fluid interface
  */
 public function filterByConfig($config, $comparison = null)
 {
     if ($config instanceof \App\Propel\Config) {
         return $this->addUsingAlias(ConfigCategoryTableMap::COL_CONFIG_CATEGORY_ID, $config->getConfigCategoryId(), $comparison);
     } elseif ($config instanceof ObjectCollection) {
         return $this->useConfigQuery()->filterByPrimaryKeys($config->getPrimaryKeys())->endUse();
     } else {
         throw new PropelException('filterByConfig() only accepts arguments of type \\App\\Propel\\Config or Collection');
     }
 }