我正在尝试使用特定的ID更新数据,该ID不起作用,但出现上述错误。
更新时,首先在数据库中搜索该特定id,然后将数据保存到MongoDB
这是我的server.js
const express = require('express');
const bodyParser = require('body-parser');
const cors = require('cors');
const mongoose = require('mongoose');
//importing MongoDB model schema
let ToDo = require('./todo.model');
const app = express();
const todoRoutes = express.Router();
const PORT = 4000;
//middlewares
app.use(bodyParser.json());
app.use(cors());
app.use('/todos', todoRoutes);
//connection to the MongoDB database
mongoose.connect('mongodb://127.0.0.1:27017/todos', {useNewUrlParser: true});
const connection = mongoose.connection;
connection.once('open', () =>{
console.log("Connected to the MongoDB through port: 27017");
});
app.listen(PORT, () => {
console.log(`Listening to port: ${PORT}`);
});
//get all data - removed to show only the code snippet I am getting errors
//get data by an ID - removed to show only the code snippet I am getting errors
//add items to database -removed to show only the code snippet I am getting errors
//update items
todoRoutes.route('/update/:id').post((req, res) => {
let id = req.params.id;
ToDo.findById(id, (err, todo) => {
if(err) throw err;
if(!todo) res.status(400).send("No data found");
todo.todo_description = req.body.todo_description;
todo.todo_responsible = req.body.todo_responsible;
todo.todo_priority = req.body.todo_priority;
todo.todo_completed = req.body.todo_completed;
res.end();
todo.save().then(todo => {
res.json(200).send("Data Updated! " + todo);
res.end();
}).catch(err => {
res.status(400).send("Error occured! " + err);
});
});
});
这就是我得到的错误...
有人能帮帮我吗?
发布于 2019-05-31 03:34:52
此错误通常意味着您多次发送响应。
注意,您发送了两个响应,一个是res.json()
,另一个是res.end()
如果出于某种原因只想结束响应,请使用res.end()
,否则请使用res.status(200).json({ result: ‘Data updated’ + todo })
如果两个都发送,它会抱怨在发送(通过res.status().json()
)之后试图修改响应(通过res.end()
)。
发布于 2019-05-31 03:20:49
在'/update/:id'
路由中,您将发送一个res.end()
,然后在3行之后再次发送。如果您删除第一个res.end()
,它应该可以工作。
如果缺少todo
,您还应该执行return
:
todoRoutes.route('/update/:id').post((req, res) => {
let id = req.params.id;
ToDo.findById(id, (err, todo) => {
if(err) throw err;
if(!todo) return res.status(400).send("No data found");
todo.todo_description = req.body.todo_description;
todo.todo_responsible = req.body.todo_responsible;
todo.todo_priority = req.body.todo_priority;
todo.todo_completed = req.body.todo_completed;
todo.save().then(todo => {
res.status(200).send("Data Updated! " + todo);
}).catch(err => {
res.status(400).send("Error occured! " + err);
});
});
});
https://stackoverflow.com/questions/56384359
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