node js express mongoose api保存操作不起作用

Question

我正在使用 Mongoose 和 Express 创建我的第一个节点 js api。当我尝试发布数据时遇到一些问题，它不起作用。邮递员请求永远不会完成，并且数据不会被保存。请找到附加的代码并帮助我找出问题所在。另请注意，数据库连接已成功建立。

//Post.js

const mongoose = require("mongoose");

const PostSchema = mongoose.Schema({
  title: {
    type: "string",
    required: true,
  },
  description: {
    type: "string",
    required: true,
  },
  date: {
    type: "Date",
    default: Date.now,
  },
});

module.exports = mongoose.model("Posts", PostSchema);

// Posts.js  => Routes
const express = require("express");
const Post = require("../models/post");
const router = express.Router();

router.get("/", (req, res) => {
  res.send("Posts");
});

router.post("/", (req, res) => {
  try {
    console.log(req.body);

    const post = new Post({
      title: req.body.title,
      description: req.body.description,
    });

    post
      .save()
      .then((data) => res.json(data))
      .catch((err) => res.json(err));
  } catch (error) {
    console.log(error);
  }
});

module.exports = router;

// app.js
const express = require("express");
const app = express();
const mongoose = require("mongoose");
require("dotenv/config");
const bodyParser = require("body-parser");

//Import Routes
const postRoute = require("./routes/posts");

//Middlewares
app.use(bodyParser.json());

//Routes
app.use("/posts", postRoute);

// Connect to db
mongoose.connect(
  process.env.DB_CONNECTION,
  { useNewUrlParser: true, useUnifiedTopology: true },
  () => {
    console.log("connected to db !");
  }
);

app.listen(3000);

更新

数据库连接本身似乎有问题。下面是我的连接字符串。我处理了错误的猫鼬连接，我得到了屏幕截图中显示的错误。

mongodb://<dbuser>:<dbpassword>@ds023550.mlab.com:23550/roofapp

Answer 1

刚刚在此处粘贴了您的代码，并且对于发布和获取都可以正常工作。

你能完成 GET 请求吗？

您的项目结构如何？

确保您正确导入文件。

从您注释掉的文件名中，您可以看到带有大写字母的 Post.js，并且您正在导入帖子。导入中似乎有问题。

这是基于您发布的代码的有效解决方案。

文件：app.js - Post.js - Router.js

app.js：

const express = require("express");
const app = express();
const mongoose = require("mongoose");
// require("dotenv/config");
const bodyParser = require("body-parser");

//Import Routes
const postRoute = require("./Router");

//Middlewares
app.use(bodyParser.json());

//Routes
app.use("/posts", postRoute);

// Connect to db
mongoose.connect("mongodb://localhost/test",
  { useNewUrlParser: true, useUnifiedTopology: true },
  () => {
    console.log("connected to db !");
  }
);

app.listen(3000);

Post.js

const mongoose = require("mongoose");

const PostSchema = mongoose.Schema({
  title: {
    type: "string",
    required: true,
  },
  description: {
    type: "string",
    required: true,
  },
  date: {
    type: "Date",
    default: Date.now,
  },
});

module.exports = mongoose.model("Posts", PostSchema);

Router.js

const express = require("express");
const Post = require("./Post");
const router = express.Router();

router.get("/", (req, res) => {
  res.send("Posts");
});

router.post("/", (req, res) => {
  try {
    console.log(req.body);

    const post = new Post({
      title: req.body.title,
      description: req.body.description,
    });

    post
      .save()
      .then((data) => res.json(data))
      .catch((err) => res.json(err));
  } catch (error) {
    console.log(error);
  }
});

module.exports = router;