public static function from($queryClassAndAlias)
{
list($class, $alias) = ModelCriteria::getClassAndAlias($queryClassAndAlias);
$queryClass = $class . 'Query';
if (!class_exists($queryClass)) {
throw new PropelException('Cannot find a query class for ' . $class);
}
$query = new $queryClass();
if ($alias !== null) {
$query->setModelAlias($alias);
}
return $query;
}
