/**
  * Returns a new sfCombineQuery object.
  *
  * @param     string $modelAlias The alias of a model in the query
  * @param     Criteria $criteria Optional Criteria to build the query from
  *
  * @return    sfCombineQuery
  */
 public static function create($modelAlias = null, $criteria = null)
 {
     if ($criteria instanceof sfCombineQuery) {
         return $criteria;
     }
     $query = new sfCombineQuery();
     if (null !== $modelAlias) {
         $query->setModelAlias($modelAlias);
     }
     if ($criteria instanceof Criteria) {
         $query->mergeWith($criteria);
     }
     return $query;
 }
 /**
  * Removes this object from datastore and sets delete attribute.
  *
  * @param      PropelPDO $con
  * @return     void
  * @throws     PropelException
  * @see        BaseObject::setDeleted()
  * @see        BaseObject::isDeleted()
  */
 public function delete(PropelPDO $con = null)
 {
     if ($this->isDeleted()) {
         throw new PropelException("This object has already been deleted.");
     }
     if ($con === null) {
         $con = Propel::getConnection(sfCombinePeer::DATABASE_NAME, Propel::CONNECTION_WRITE);
     }
     $con->beginTransaction();
     try {
         $deleteQuery = sfCombineQuery::create()->filterByPrimaryKey($this->getPrimaryKey());
         $ret = $this->preDelete($con);
         // symfony_behaviors behavior
         foreach (sfMixer::getCallables('BasesfCombine:delete:pre') as $callable) {
             if (call_user_func($callable, $this, $con)) {
                 $con->commit();
                 return;
             }
         }
         if ($ret) {
             $deleteQuery->delete($con);
             $this->postDelete($con);
             // symfony_behaviors behavior
             foreach (sfMixer::getCallables('BasesfCombine:delete:post') as $callable) {
                 call_user_func($callable, $this, $con);
             }
             $con->commit();
             $this->setDeleted(true);
         } else {
             $con->commit();
         }
     } catch (Exception $e) {
         $con->rollBack();
         throw $e;
     }
 }