public static function findByProjectId($projectId)
 {
     $documents = parent::findByProjectId($projectId);
     $documentsWithInfo = array();
     foreach ($documents as $d) {
         $information = DocumentsInformation::find(array("documentId=" . $d->id, "order" => "uploadDate DESC", "limit" => 3));
         $documentsWithInfo[$d->id] = $information->toArray();
     }
     return $documentsWithInfo;
 }