这个Jade文件中的错误在哪里？

Question

Jade并不是一种易于使用的语言，因为它没有适当的缩进，但是在这种情况下，缩进似乎不是问题，我有Google-Foo的错误，找不到与正在发生的情况匹配的错误这里。

这是我的addpost.jade文件：

extends layout

block content
    h1=title
    ul.errors
        if errors
            each error, i in errors
                li.alert.alert-danger #{error.msg}
    form(method='post', action='/posts/add', enctype="multipart/form-data")
        .form-group
            label Title:
            input.form-control(name='title', type='text')
        .form-group
            label Category
            select.form-control(name='category')
                each category, i in categories
                    option(value='#{category.title}') #{category.title}
        .form-group
            label Body
            textarea.form-control(name='body', id='body')
        .form-group
            label Main Image:
            input.form-control(name='mainimage', type='file')
        .form-group
            label Author
            select.form-control(name='author')
                option(value='Daniel Cortes') Daniel Cortes
                option(value='Alejandra Rocha') Alejandra Rocha
        input.btn.btn-default(name='submit', type='submit', value='Save')

这是我得到的错误：

addpost.jade：16 14 | 标签类别15 | select.form-control（name ='category'）> 16 | 每个类别，第17个类别中的i | option（value ='＃{category.title}'）＃{category.title} 18 | .form-group 19 | 标签主体无法读取未定义的属性“长度”

这是我的posts.js文件：

var express = require('express');
var router = express.Router();
var mongo = require('mongodb');
var db = require('monk')('localhost/nodeblog');

router.get('/add', function(req, res, next){
    var categories = db.get('categories');

    categories.find({},{},function(err, categories){
        res.render('addpost',{
        "title": "Add Post",
        "categories": categories
        });
    });


});

router.post('/add', function(req, res, next){
    // Get Form Values
    var title       = req.body.title;
    var category    = req.body.category;
    var body        = req.body.body;
    var author      = req.body.author;
    var date        = new Date();

    if(req.files.mainimage){
        var mainImageOriginalName   = req.files.mainimage.originalname;
        var mainImageName           = req.files.mainimage.name;
        var mainImageMime           = req.files.mainimage.mimetype;
        var mainImagePath           = req.files.mainimage.path;
        var mainImageExt            = req.files.mainimage.extension;
        var mainImageSize           = req.files.mainimage.size;
    } else {
        var mainImageName = 'noimage.png';
    }

    // Form Validation
    req.checkBody('title','Title field is required').notEmpty();
    req.checkBody('body', 'Body field is required');

    // Check errors
    var errors = req.validationErrors();

    if(errors){
        res.render('addpost',{
            "errors": errors,
            "title": title,
            "body": body
        });
    } else {
        var posts = db.get('posts');

        // Submit to db
        posts.insert({
            "title": title,
            "body": body,
            "category": category,
            "date": date,
            "author": author,
            "mainimage": mainimage
        }, function(err, post){
            if(err){
                res.send('There was an issue submitting the post');
            } else {
                req.flash('success','Post Submitted');
                res.location('/');
                res.redirect('/');
            }
        });
    }
});

module.exports = router;

我的app.js文件：

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var expressValidator = require('express-validator');
var cookieParser = require('cookie-parser');
var session = require('express-session');
var bodyParser = require('body-parser');
var mongo = require('mongodb');
var db = require('monk')('localhost/nodeblog');
var multer = require('multer');
var flash = require('connect-flash');

var routes = require('./routes/index');
var posts = require('./routes/posts');

var app = express();

app.locals.moment = require('moment');

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

// Handle File Uploads & Multipart Data
// app.use(multer({dest: './uploads'}));
app.use(multer({dest:'./uploads/'}).single('singleInputFileName'));

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());

// Express Session
app.use(session({
  secret: 'secret',
  saveUninitialized: true,
  resave: true
}));

// Express Validator
app.use(expressValidator({
  errorFormatter: function(param, msg, value){
    var namespace = param.split('.'),
    root = namespace.shift(),
    formParam = root;

    while(namespace.length) {
      formParam += '[' + namespace.shift() + ']';
    }
    return {
      param : formParam,
      msg   : msg,
      value : value
    };
  }
}));

app.use(express.static(path.join(__dirname, 'public')));

// Connect Flash
app.use(flash());
app.use(function (req, res, next) {
  res.locals.messages = require('express-messages')(req, res);
  next();
});

// Make our db accessible to our router
app.use(function(req, res, next){
  req.db = db;
  next();
});

app.use('/', routes);
app.use('/posts', posts);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
      message: err.message,
      error: err
    });
  });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
  res.status(err.status || 500);
  res.render('error', {
    message: err.message,
    error: {}
  });
});


module.exports = app;

Answer 1

看来categories没有传递给视图或其不是数组。

您可以添加呈现模板的代码吗？ 也许我们可以在那里找到问题。