public static void ajaxEditDocument(Long documentId, String newTitle, String newContent) {
Document document = Document.findById(documentId);
document.changeSubject(newTitle);
Config config = Config.getInstance();
User currentUser = User.findById(config.getSingedInUserId());
Version newVersion = new Version(currentUser, document, newContent).save();
System.out.println("* A new version is successfully created.");
document.addVersion(newVersion);
document.save();
}
