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