问SilverStripe虚拟页面/菜单项

EN

class ChildRedirectorPage extends Page 
{
    private static $description = 'Page that has no content but automatically redirects to the first of its child-pages';

    public function ContentSource() {
        if($firstChild = $this->Children()->First()) {
            return $firstChild;
        } else {
            return $this;
        }       
    }

    public function Link($action = null) {
        // prevent link "redirection" when we're in CMS
        if (!is_subclass_of(Controller::curr(),'LeftAndMain')){
            if($firstChild = $this->Children()->First()) return $firstChild->Link($action);
            else return parent::Link($action);
        }
    }

    public function getCMSFields() {
        $fields = parent::getCMSFields();
        $fields->removeByName('Content', true);
        return $fields;
    }
}

class ChildRedirectorPage_Controller extends Page_Controller 
{
    function init() {
        parent::init();
        if($firstChild = $this->Children()->First()) {
            $this->redirect($firstChild->Link(), 301);
        }           
    }
}