用于Propel 1.5.6的Autoloader似乎无法完全正常工作

<?php

// Set up some paths & schema info
$projectPath = realpath( dirname( __FILE__ ) . DIRECTORY_SEPARATOR . '..' );
$schemaName = 'database';
$modelPath = $projectPath . "/${schemaName}/build/classes";

// Init propel
require_once $projectPath . '/lib/propel-1.5/runtime/lib/Propel.php';
Propel::init($projectPath . "/${schemaName}/build/conf/${schemaName}-conf.php");

// Add the generated 'classes' directory to the include path
set_include_path($modelPath . PATH_SEPARATOR . get_include_path());

// This seems to be sufficient to get the autoloader working ***
require_once $modelPath . '/database/NodePeer.php';

$node = new Node();
$node->setName('My Node');
$node->setHash(sha1($node->getName()));
$node->save();

$nodes = NodePeer::doSelect(new Criteria());
echo 'Node count: ' . count($nodes) . "n";
?>