在Keystone.js 4中动态创建菜单，需要重新启动服务器才能看到效果

问题描述

我有一个艺术网站：www.andreipetrov.com建立在Keystone 4和MongoDB上

菜单是从称为类别的列表中动态创建的。效果很好，但是，在编辑列表时，仅在重新引导服务器时更改输出的菜单。

如何做到这一点，以便在每次刷新页面时更新菜单？

这是我在routes文件夹中的index.js文件和我的哈巴狗模板

const keystone = require('keystone');
const middleware = require('./middleware');
const importRoutes = keystone.importer(__dirname);
var ArtCategory = keystone.list('ArtCategory');

var myCategory;


keystone.pre('render',middleware.theme);
keystone.pre('render',middleware.flashMessages);

keystone.set('404',function (req,res,next) {
    middleware.theme(req,next);
    res.status(404).render('errors/404');
});

// Load Routes
var routes = {
    download: importRoutes('./download'),views: importRoutes('./views'),};

exports = module.exports = function (app) {

    ArtCategory.model.find()
        .sort('sortOrder')
        .exec(function (err,category) {
            if (err) {
                return res.serverError(err,"Error loading current user's owned listings.");
            }
            myCategory = category;
        });

    keystone.pre('render',next) {
        res.locals.navLinks = [];
        myCategory.forEach(element => {
            res.locals.navLinks.push({ label: element.name,key: element.key,href: '/works/' + element.key },)
        });
        console.log('navLinks',res.locals.navLinks)
        res.locals.user = req.user;
        res.locals.theUrl = req.url
        //console.log('the req is ',req.url)
        next();
    });

    // Views
    app.get('/',routes.views.index);
    app.get('/blog/:category?',routes.views.blog);
    app.all('/blog/post/:post',routes.views.post);
    app.get('/works/:category?',routes.views.work);
    app.all('/contact',routes.views.contact);

    // Downloads
    app.get('/download/users',routes.download.users);

}

和我的模板哈巴狗文件

doctype html
html
    head
        link(rel='stylesheet',href='https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css',integrity='sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T',crossorigin='anonymous')

        Meta(charset="utf-8")
        Meta(name="viewport",content="initial-scale=1.0,user-scalable=no,maximum-scale=1,width=device-width")
        title=title || 'Andrei Petrov'
        link(rel="shortcut icon",href="/favicon.ico",type="image/x-icon")
        link(href='http://fonts.googleapis.com/css?family=Open+Sans:400italic,400,300,600,700',rel='stylesheet')
        
        block css
        block head
    body
        if locals.section == 'home'
            block content
        else
            nav.navbar.navbar-expand-sm.navbar-light.bg-light(style='position: fixed;left: 100;top: 0;width: 100%;z-index:1000;background: rgba(76,175,80,0.3)')
                a.navbar-brand(href='#') Andrei Petrov
                button.navbar-toggler(type='button',data-toggle='collapse',data-target='#navbarNavDropdown',aria-controls='navbarNavDropdown',aria-expanded='false',aria-label='Toggle navigation')
                    span.navbar-toggler-icon
                #navbarNavDropdown.collapse.navbar-collapse
                    ul.navbar-nav
                        
                        
                        each link in navLinks
                            li.nav-item
                                a.nav-link(class=(theUrl.match(link.key)) ? 'active' : '',href=link.href)=link.label

                    
            .container-fluid.p-0
                //- intro
                block intro
                //- messages
                +flash-messages(messages)
                //- content
                block content
                //- footer

        script(src='https://code.jquery.com/jquery-3.4.1.min.js',integrity='sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=',crossorigin='anonymous')
        script(src='https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js',integrity='sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1',crossorigin='anonymous')
        script(src='https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js',integrity='sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM',crossorigin='anonymous')

        block page-js
        
        ```

解决方法

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