Disabling crc32 based cache methods in cakephp-1.3

AppModel.php

class AppModel extends Model {
	public function __construct($id = false, $table = null, $ds = null) {
		if($ds) {
			$ds->cacheMethods = false;
			$ds->cacheSources = false;
		}
		parent::__construct($id, $table, $ds);
		$this->setDataSource($this->useDbConfig);
		$db =& ConnectionManager::getDataSource($this->useDbConfig);
		$db->cacheMethods = false;
		$this->cacheSources = false;
	}
}