Question

我设置了Mongo，我正在做的就是在index.jade中，循环查看一系列餐点。

- app.js -

/ ** *模块依赖性。 * /

var express = require('express')
mongoose = require('mongoose')
, routes = require('./routes')
, meal = require('./routes/meal')
, http = require('http')
, path = require('path');

var app = express();

// all environments
app.set('port', process.env.PORT || 3000);
app.set('views', __dirname + '/views');
app.set('view engine', 'jade');
app.use(express.favicon());
app.use(express.logger('dev'));
app.use(express.bodyParser());
app.use(express.methodOverride());
app.use(app.router);
app.use(require('less-middleware')({ src: __dirname + '/public' }));
app.use(express.static(path.join(__dirname, 'public')));

// development only
if ('development' == app.get('env')) {
app.use(express.errorHandler());
}

app.get('/', routes.index);
app.get('/new', meal.new);

app.get('/meals', meal.getMeals)
app.post('/meals', meal.add)

app.get('')
http.createServer(app).listen(app.get('port'), function(){
console.log('Express server listening on port ' + app.get('port'));
});

--meals.js--


var mongoose = require('mongoose');

mongoose.connect("mongodb://localhost/nutritionTracker")

var MealSchema = new mongoose.Schema({
mealId: Number,
mealType: String,
mealDetails: String
}),

Meals = mongoose.model('Meals', MealSchema);


/*
* New meal.
*/

exports.new = function(req, res){
res.render('new');
};

/*
* Insert new meal.
*/

exports.add = function(req, res){

var meal = req.body;

new Meals({
mealId: 1,
mealType: meal.mealType,
mealDetails: meal.mealDetails
}).save(function (err, docs) {
if (err) res.render("Error")
});
res.render('new');
};

/*
* Get all meals.
*/

exports.getMeals = function(req, res){
Meals.find({}, function(err, docs) {
res.render('index', { meals: docs });
});
};

- index.jade -

扩展布局

block content
table.table.table-striped
thead
tr
th Meal Type
th Meal Details
tbody
each meal in meals
tr 
td #{meal.type}
td #{meal.details}

a(href="/new", class="btn btn-primary btn-lg") Add Meal

我一直收到这个错误：

TypeError：... \ views \ index.jade：10 8 |膳食细节9 | tbody＆gt; 10 |每顿饭11 | tr 12 | td＃{meal.type} 13 | td＃{meal.details}无法读取未定义的属性“长度”

有什么想法吗？

Answer 1

不确定您发布的是什么，但您可能希望确保您的查询实际上带回了您的期望。您在回调中传递的err变量是您不使用的。

试试这个，让我知道它带来了什么：

exports.getMeals = function(req, res){
    Meals.find({}, function(err, docs) {
        console.log(err, docs);
        if(err) return res.send(500, {
            error: err
        });
        res.render('index', { meals: docs });
    });
}

Cannot read property 'length' of undefined可能是玉抱怨它无法遍历结果，因为它们无效（数组）。

Answer 2

问题可能在于您的渲染代码，您的代码会使用jade修改响应。这是变量传递给jade的地方，我猜想最近对jade和express的更新可能会导致问题。

当我更新我的玉石和快递时，我收到了这些错误。我查看了examples in the jade repository.在最新的jade@0.26.3和express@3.4.8中，服务器呈现了一个包含如下数据的玉文件：

server.get('/', function(req, res) {
  return res.render('index.jade', {
    title: 'Blog',
    description: 'Your Page Description',
    users: users
  });
});

使用return res.render('index.jade', {meals:meals});与旧版本不同。

Express / Jade TypeError

2 个答案: