Question

我想显示mongodb集合中的数据

我正在使用pug并想在mongodb中显示我的数据收集

但是我不知道这个错误

我已经尝试过

这是我的.pug文件

extends layout

block content
    if registrations.length
        table
            tr
                th Name
                th Email
            each registration in registrations
                tr
                    td=registration.name
                    td=registration.email
    else
        p No registrations yet

这是我的index.js文件


const Registration = mongoose.model('Registration');
router.get('/registrations', (req, res) => {
    Registration.find()
        .then((registrations) => {
            res.render('index', { title: 'Listing registrations' });
        })
        .catch(() => { res.send('Something went wrong'); });
});

这是错误消息

TypeError: E:\web_apps_project\demo-node-app\views\index.pug:4
    2| 

    3| block content

  > 4|     if registrations.length

    5|         table

    6|             tr

    7|                 th Name


Cannot read property 'length' of undefined
    at eval (eval at wrap (E:\web_apps_project\demo-node-app\node_modules\pug-runtime\wrap.js:6:10), <anonymous>:21:19)
    at template (eval at wrap (E:\web_apps_project\demo-node-app\node_modules\pug-runtime\wrap.js:6:10), <anonymous>:79:50)
    at Object.exports.renderFile (E:\web_apps_project\demo-node-app\node_modules\pug\lib\index.js:427:38)
    at Object.exports.renderFile (E:\web_apps_project\demo-node-app\node_modules\pug\lib\index.js:417:21)
    at View.exports.__express [as engine] (E:\web_apps_project\demo-node-app\node_modules\pug\lib\index.js:464:11)
    at View.render (E:\web_apps_project\demo-node-app\node_modules\express\lib\view.js:135:8)
    at tryRender (E:\web_apps_project\demo-node-app\node_modules\express\lib\application.js:640:10)
    at Function.render (E:\web_apps_project\demo-node-app\node_modules\express\lib\application.js:592:3)
    at ServerResponse.render (E:\web_apps_project\demo-node-app\node_modules\express\lib\response.js:1012:7)
    at Registration.find.then (E:\web_apps_project\demo-node-app\routes\index.js:36:17)
    at process._tickCallback (internal/process/next_tick.js:68:7)

Answer 1

您需要将数据库查询返回的注册信息传递给模板，如下所示：

router.get('/registrations', (req, res) => {
    Registration.find()
        .then((registrations) => {
            res.render('index', { title: 'Listing registrations', 'registrations': registrations });
        })
        .catch(() => { res.send('Something went wrong'); });
});

Jade-尝试从mongodb显示显示数据

1 个答案: