Question

一切似乎都运转良好，但是当试图达到＆＃39; / posts / new＆＃39;我得到＆＃34; TypeError：无法读取属性＆＃39; title＆＃39; of null＆＃34;引用＆＃39; /routes/posts.js:24＆＃39;这是在＆＃39; /：title＆＃39; GET方法。有什么想法吗？

＆＃39;路线/ posts.js＆＃39;

void DataGridView1_MouseWheel(object sender, MouseEventArgs e)
{
    int currentIndex = this.DataGridView1.FirstDisplayedScrollingRowIndex;
    int scrollLines = SystemInformation.MouseWheelScrollLines;

    if (e.Delta > 0) 
    {
        this.DataGridView1.FirstDisplayedScrollingRowIndex = Math.Max(0, currentIndex - scrollLines);
    }
    else if (e.Delta < 0)
    {
        if (this.DataGridView1.Rows.Count > (currentIndex + scrollLines))
            this.DataGridView1.FirstDisplayedScrollingRowIndex = currentIndex + scrollLines;
    }
}

＆＃39;视图/帖/新＆＃39;与Swig：

var express = require('express');
var router = express.Router();
var mongoose = require('mongoose');
var Post = mongoose.model('posts');

/* posts displays*/
// posts index
router.get('/', (req, res) => {
    Post.find((err, posts) => {
        res.render(
            'posts/index', 
            {
                title: 'Get All the Posts!',
                posts: posts 
            }
        );
    });
});

// single post
router.get('/:title', (req, res) => {
    var query = {"title": req.params.title};
    Post.findOne(query, (err, post) => {
        res.render(
            'posts/post',
            {
                title: post.title,
                date: post.date,
                body: post.body
            }
        );
    });
});

/* posts new */
router
    // GET new posts route and form
    .get('/new', (req, res) => {
        res.render('posts/new', { title: 'Add a new Post' });
    })
    // POST new post data
    .post('/new', (req, res) => {
        new Post({
            title: req.body.title,
            date: req.body.date,
            body: req.body.body
        })
        // Save post to db 
        .save((err, post) => {
            res.redirect('/posts');
        });
    });

/* posts edit */
router
    // GET the post
    .get('/edit/:title', (req, res) => {
        var query = {'title': req.params.title};
        Post.findOne(query, (err, post) => {
            res.render(
                'posts/edit',
                {
                    title: post.title,
                    date: post.date,
                    body: post.body
                }
            );
        });
    })
    // PUT to update the post
    .put('/edit/:title', (req, res) => {
        var query = {'title': req.params.title};
        var update = {
            title: req.body.title,
            body: req.body.body
        };
        var options = {new: true};
        Post.findOneAndUpdate(query, update, options, (err, post) => {
            res.render(
                'posts/post',
                {
                    title: post.title,
                    date: post.date,
                    body: post.body
                }
            );
        });
    })
    // DELETE to delete a post
    .delete('/edit/:title', (req, res) => {
        var query = {'title': req.params.title};
        Post.findOneAndRemove(query, (err, posts) => {
            res.redirect('/');
        })
    });

module.exports = router;

Answer 1

尝试将/new的路由放在通用/:title根目录之前。

因为首先定义了/:title，所以如果它匹配则会首先调用它（它会这样做）。由于您没有名为“new”的帖子，因此您的数据库搜索会显示为空。你可能应该有一个错误处理程序。错误似乎在title: post.title行。

如果首先定义/new，如果匹配则会调用它。如果没有，则通用/:title将更加通用。

节点/快速路由问题 - 调用不正确的路径

1 个答案: