错误状态：404使用Node.js（express）、Angular和MongoDB返回PUT请求

我一直在想如何将我的数据（“Post”）更新到MongoDB（我使用的是Mongoose、MongoDB、Node、Express和Angular 9.1.1）。我在POST和DELETE方面没有问题，但我无法找出PUT的错误所在

提前感谢，非常感谢您的帮助-杰夫

角度：文件post.ts

export class Post {
    id: string;
    title: string;
    message: string;
 }

角度：文件postsService.ts

//Working OK
deletePost(postId: string) {
    this.http.delete(`http://localhost:3000/api/posts/${postId}`)
        .subscribe(() => {
            const updatedPosts = this.posts.filter(post => post.id !== postId);
            this.posts = updatedPosts;
            this.postsUpdate$.next([...this.posts]);
        });
    }

//Not working - I want to update one post
updatePost(postId: string, postTitle: string, postMessage: string) {
    const post: Post = { id: postId, title: postTitle, message: postMessage };
    this.http.put(`http://localhost:3000/api/posts/${postId}`, post)
        .subscribe(response => console.log(response));
    }

节点服务器：文件backend/app.js

// Working OK
app.delete("/api/posts/:id", (req, res, next) => {
    Post.deleteOne({ _id: req.params.id }).then((result) => {
        console.log(req.params.id);
        res.status(200).json({ msg: "Post deleted successfully!" });
    });
});

//Not working - I want to update one post
// Post is defined in file: backend/model/post.js
app.put("/api/post/:id", (req, res, next) => {
    const post1 = new Post({
        _id: req.body.id,
        title: req.body.title,
        message: req.body.message,
    });
Post.findOneAndUpdate({ _id: req.params.id } ,post1)
    .then((result) => {
    console.log(result);
    res.status(200).json({ msg: "Updated successfully!" });
    });
});

节点：backend/model/post.js

const mongoose = require("mongoose");

//note "String is a class used in node/mongoDB"
const postSchema = mongoose.Schema({
    title: { type: String, required: true },
    message: { type: String, required: true },
});
// this will automaticly be stored in collection "posts"
module.exports = mongoose.model('Post', postSchema);

浏览器中出现错误：

// HEADERS:
Request URL:http://localhost:3000/api/posts/5ef676c71105924a08b9e919
Request Method:PUT
Remote Address:127.0.0.1:3000
Status Code:
404
Version:HTTP/1.1
Referrer Policy:strict-origin-when-cross-origin

// REQUEST:
 
Request Payload:
{"id":"5ef676c71105924a08b9e919", "title":"first Post ", "message":"This is just some text"}

// RESPONCE:
Cannot PUT /api/posts/5ef676c71105924a08b9e919

但在URL上，在GET上一切都很好：

{"msg":"Post fetched successfully!","posts":{"_id":"5ef676c71105924a08b9e919","title":"first Post ","message":"This is just some text","__v":0}}

---

似乎你正在尝试更新一篇文章的记录，所以你可以简单地尝试一下

router.put('/api/post/:id', async (req, res, next) => {
    return Post.updateOne({
            _id: req.params.id
        }, {
            $set: {
                title: req.body.title,
                message: req.body.message
            }
        })
        .then(result => res.json(result))
        .catch(err => console.log(err))
});

---

不需要创建新的Post，因为您正试图根据

id

更新现有记录，并且您正在发送类似

api/Post

的路由路径，但是您收到服务器

api/posts

的响应，因此也要检查您的路由路径。

您的api put请求指向错误的url 棱角的

后端

app.put("/api/post/:id", (req, res, next) => {

---

一个是帖子，另一个是帖子。它们必须是一样的。

非常感谢-就是这样-请注意，不要太累；）不客气。像这样的东西几乎总是一个你看不到的打字错误，因为你知道应该有什么，所以你看不到有什么。干杯，这是不匹配的路径。感谢您展示完整的错误处理代码。我会试试的

app.put("/api/post/:id", (req, res, next) => {