Question

我正在尝试向服务器（mongodb）发出发布请求，但出现此错误：

UnhandledPromiseRejectionWarning：TypeError：无法读取未定义的属性“ todo_description”

我在本地主机上运行mongodb

// Require Express
const express = require("express");

// Setting Express Routes
const router = express.Router();

// Set Up Models
const Todo = require("../models/todo");

// Get All Todos
router.get("/", async (req, res) => {
  try {
    const todo = await Todo.find();
    res.json(todo);
  } catch (err) {
    res.json({ message: err });
  }
});

router.get("/:id", async (req, res) => {
  try {
    const id = req.params.id;
    await Todo.findById(id, (err, todo) => {
      res.json(todo);
    });
  } catch (err) {
    res.json({ message: err });
  }
});

router.post("/add", async (req, res) => {
  const todo = new Todo({
    todo_description: req.body.todo_description,
    todo_responsible: req.body.todo_responsible,
    todo_priority: req.body.todo_priority,
    todo_completed: req.body.todo_completed,
  });

  try {
    await todo.save();
    res.json(todo);
  } catch (err) {
    res.json({ message: err });
  }
});

router.patch("/update/:id", async (req, res) => {
  try {
    const updateTodo = await Todo.updateOne(
      { _id: req.params.id },
      { $set: { todo_description: req.body.todo_description } }
    );
    updateTodo.save().then(updateTodo => {
      res.json(updateTodo);
    });
  } catch (err) {
    res.json({ message: err });
  }
});

router.delete("/delete/:id", async (req, res) => {
  try {
    const deleteTodo = await Todo.deleteOne({ _id: req.params.id });
    res.json(deleteTodo);
  } catch (err) {
    res.json({ message: err });
  }
});

module.exports = router;

我的待办事项模型

// Require Mongoose
const mongoose = require("mongoose");

// Define Schema
// const Schema = new mongoose.Schema;

// Define Todo-Schema
const TodoSchema = new mongoose.Schema({
  // Creating Fields
  todo_description: {
    type: String
  },
  todo_responsible: {
    type: String
  },
  todo_priority: {
    type: String
  },
  todo_completed: {
    type: Boolean
  },
  todo_date: {
    type: Date,
    default: Date.now
  }
});

// Compile Model From Schema
// const TodoModel = mongoose.model("Todos", TodoSchema);

// Export Model
module.exports = mongoose.model("todos", TodoSchema);

错误消息：

（节点：548）UnhandledPromiseRejectionWarning：TypeError：无法读取未定义的属性“ todo_description” 在router.post（C：\ Users \ kinG \ Desktop \ projects \ protoinofprototype \ mern \ backend \ routes \ todo.js：33：32）在Layer.handle上[作为handle_request]（C：\ Users \ kinG \ Desktop \ projects \ mountain-of-prototype \ mern \ backend \ node_modules \ express \ lib \ router \ layer.js：95：5）

谢谢

Answer 1

您正在从todo_description访问req.body。仅当您添加req.body中间件或自己添加类似的中间件时，body-parser才可用。

在加载路线之前添加此内容：

const bodyParser = require('body-parser');
const express = require('express');

const app = express();

app.use(bodyParser.json());

您也可以将其添加到特定路线。进一步了解here。

Answer 2

您应该在应用程序的主文件中使用body-parser。它在中间件解析主体之前为您提供了解析的json，默认情况下为字符串形式。并确保您在req.body中发送todo_description（使用前应检查）。

const bodyParser = require('body-parser');
app.use(bodyParser.json());

在特快专递要求中解决UnhandledPromiseRejectionWarning

2 个答案: