/**
* Helper method which returns the primary key contained
* in the given Criteria object.
*
* @param Criteria $criteria A Criteria.
* @return ColumnMap If the Criteria object contains a primary
* key, or null if it doesn't.
* @throws \Propel\Runtime\Exception\RuntimeException
*/
private static function getPrimaryKey(Criteria $criteria)
{
// Assume all the keys are for the same table.
$keys = $criteria->keys();
$key = $keys[0];
$table = $criteria->getTableName($key);
$pk = null;
if (!empty($table)) {
$dbMap = Propel::getServiceContainer()->getDatabaseMap($criteria->getDbName());
$pks = $dbMap->getTable($table)->getPrimaryKeys();
if (!empty($pks)) {
$pk = array_shift($pks);
}
}
return $pk;
}
