POST 400 Bad request,React,Node / Express,MongoDB

问题描述 投票:0回答:1

我正在学习构建一个简单的MERN应用程序来获取用户数据并将其上传到mongoDB集合,我似乎无法弄清楚为什么我在尝试发布用户数据时收到400 BAD REQUEST错误。它目前正在本地服务器上运行。我目前无法找到直接解决我的特定问题的帖子。

这是我的data.js数据模式:

const mongoose = require("mongoose");
const Schema = mongoose.Schema;

const data = new Schema(
    {
        x: Number,
        y: Number,
        z: Number,
        r: Number,
        g: Number,
        b: Number
    },
    { collection: "cube" }
);

module.exports = mongoose.model("data", DataSchema);

我的server.js后端:

// JavaScript source code
const mongoose = require("mongoose");
const express = require("express");
const bodyParser = require("body-parser");
const logger = require("morgan");
const Data = require("./data");
const cors = require("cors");

const API_PORT = 3000;
const app = express();
const router = express.Router();

//MongoDB database
const dbRoute = "mongodb+srv://testuser:[email protected]/test?retryWrites=true";

mongoose.connect(
    dbRoute,  
    { useNewUrlParser:true }
);

let db = mongoose.connection;

db.once("open", () => console.log("Connected to database"));

db.on("error", console.error.bind(console, "MongoDB connection error:"));

// bodyParser, parses the request body to be a readable json format
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.use(logger("dev"));

//this is our add method
//add method to add data into database
router.post ("/putData", (req, res) => {
    let data = new Data(req.body);

    data.save()
    .then(data => {
        res.json('Values added successfully');
    })
    .catch(err => {
        res.status(400).send("unable to save to database");
    });
});

app.use("/api", router);
app.use(express.json());

app.listen(API_PORT, () => console.log('Listening on port ${API_PORT}'));

最后我的App.js前端:

import React, { Component } from "react";
import axios from "axios";

class App extends Component {
    state = {
        x: 0,
        y: 0,
        z: 0,
        r: 0,
        g: 0,
        b: 0
    };

    addData = (xVal, yVal, zVal, rVal, gVal, bVal) => {
        axios.post("http://localhost:3000/api/putData", {
            x: xVal,
            y: yVal,
            z: zVal,
            r: rVal,
            g: gVal,
            b: bVal
        })
        .then(response => { 
            console.log(response)
        })
        .catch(error => {
            console.log(error.response)
        });
// reset state
        // this.setState({
        //     x: 0,
        //     y: 0,
        //     z: 0,
        //     r: 0,
        //     g: 0,
        //     b: 0
        // })

    };

//UI
    render(){
        return (
            <div>  
                <ul>
                    <p> Please enter all applicables values for x, y, z, and r, g, b. </p>
                </ul>
                <div>
                    <label> X </label>
                    <input type="number" min="0" max="360" onChange={e => this.setState({x: e.target.value})} placeholder="0" style={{width:"40px"}} />
                    <label> Y </label>
                    <input type="number" min="0" max="360" onChange={e => this.setState({y: e.target.value})} placeholder="0" style={{width:"40px"}} />
                    <label> Z </label>
                    <input type="number" min="0" max="360" onChange={e => this.setState({z: e.target.value})} placeholder="0" style={{width:"40px"}} />
                    <label> R </label>
                    <input type="number" min="0" max="255" onChange={e => this.setState({r: e.target.value})} placeholder="0" style={{width:"40px"}} />
                    <label> G </label>
                    <input type="number" min="0" max="255" onChange={e => this.setState({g: e.target.value})} placeholder="0" style={{width:"40px"}} />
                    <label> B </label>
                    <input type="number" min="0" max="255" onChange={e => this.setState({b: e.target.value})} placeholder="0" style={{width:"40px"}} />
                    <button onClick={() => this.addData(this.state.x, this.state.y, this.state.z, this.state.r, this.state.g, this.state.b)}>
                    Add
                    </button>
                </div>
            </div>
        );
    }
}

export default App;

根据谷歌浏览器中的控制台,这是我收到错误的地方:

![Full error message

我目前不确定为什么我收到这个错误,罪魁祸首在哪里,我可以做些什么来解决它。

EDIT1:编辑错误消息。

node.js mongodb mern
1个回答
1
投票

有两个主要问题阻止您的代码工作:

您没有正确地从data.js导出Schema:

更改你的module.exports

module.exports = mongoose.model("data", DataSchema);

module.exports = mongoose.model("data", data);

您在这里引用架构作为数据const data = new Schema(...)

同样,您也会收到CORS错误,因为您尚未在server.js中使用它。你需要添加:

app.use(cors());
app.options('*', cors());

到上面的server.js文件:

// bodyParser, parses the request body to be a readable json format
app.use(bodyParser.urlencoded({ extended: false }));

这让它在我的localhost上工作。但是,我强烈建议不要在生产环境中使用该设置。查看CORS模块以获取更多设置选项:

https://www.npmjs.com/package/cors

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