Node.js 在 Heroku 上部署失敗：TypeError：無法讀取 null 的屬性“拆分”

Question

有誰知道錯誤是什么意思？ 我在 Node.js 上有我的應用程序，在 Atlas 上有我的數據庫。 當我嘗試在 Heroku 上部署它時，我在日志中收到以下錯誤消息：

TypeError：無法在 parseSrvConnectionString （/app/node_modules/mongodb/lib/core/uri_parser.js:40:23）處讀取 null 的屬性“拆分”（/app/node_modules/mongodb/lib/core/uri_parser.js： 556:12) 在連接 (/app/node_modules/mongodb/lib/operations/connect.js:272:3)
在 /app/node_modules/mongodb/lib/mongo_client.js:218:5 在 MaybePromise (/app/node_modules/mongodb/lib/utils.js:719:3) 在 MongoClient.connect (/app/node_modules/mongodb/lib /mongo_client.js:214:10) 在 Function.MongoClient.connect (/app/node_modules/mongodb/lib/mongo_client.js:432:22) 在 Database.connect (/app/database.js:9:15) 在Object。 (/app/database.js:21:4) 在 Module._compile (internal/modules/cjs/loader.js:1118:30) [31m[nodemon] 應用程序崩潰 - 在開始之前等待文件更改...[39m

數據庫.js

const mongo = require('mongodb').MongoClient; require('dotenv').config()

class Database {
    constructor() {
        this.client = null;
    }
    connect() {
        mongo.connect(process.env.URL_DATABASE, { useNewUrlParser: true, useUnifiedTopology: true }, (err, client) => {
            if (err) throw err
            this.client = client;

        });
    } }




const db = new Database(); db.connect(); console.log(db); module.exports = db;

路由器.js

const express = require('express'),
    router = express.Router();
const db = require('./database');
const ObjectId = require('mongodb').ObjectID;

// GET ALL

router.get('/books', (req, res, next) => {

    const localdb = db.client.db(process.env.DB_NAME);
    const collection = localdb.collection(process.env.COLL_BOOKS);
    collection.find({}).toArray(function (err, docs) {
        if (err) throw err
        res.status(200).send(docs);
    });
});

// GET ONE

router.get('/books/:name', (req, res, next) => {
    let name = req.params.name
    const localdb = db.client.db(process.env.DB_NAME);
    const collection = localdb.collection(process.env.COLL_BOOKS);
    collection.findOne({ "name": name }, function (err, docs) {
        if (err) throw err
        res.status(200).send(docs);
    });
});

// POST ONE

router.post('/books', (req, res, next) => {
    const localdb = db.client.db(process.env.DB_NAME);
    const collection = localdb.collection(process.env.COLL_BOOKS);
    let newBook = req.body;
    collection.insertOne(newBook, function (err) {
        if (err) throw err
        res.status(201).send(true);

    });
});

// DELETE ONE

router.delete('/books/:name', (req, res, next) => {
    const localdb = db.client.db(process.env.DB_NAME);
    const collection = localdb.collection(process.env.COLL_BOOKS);
    collection.deleteOne({ "name": req.params.name }, function (err) {
        if (err) throw err
        res.status(200).send(true)

    })
});

// PUT ONE

router.put('/books/:name', (req, res, next) => {
    const localdb = db.client.db(process.env.DB_NAME);
    const collection = localdb.collection(process.env.COLL_BOOKS);
    collection.updateOne({  "name": req.params.name }, { $set: req.body }, function (err) {
        if (err) throw err
        res.status(201).send(true);
    });

});

module.exports = router;

應用程序.js

    const express = require('express'),
        app = express();
    os = require('os');
    const bodyParser = require('body-parser');
    const cors = require('cors');
    const router = require('./router.js')
    require('dotenv').config()


    app.use(cors());
    app.use(bodyParser.json());

    app.use('/api/v1', router);

    const port = (process.env.PORT || '3001');

let server = app.listen(port, os.hostname(), () => {
    let host = server.address().address,
        port = server.address().port;
    console.log("Example app listening at http://%s:%s", host, port);
});

Answer 1

我遇到了同樣的問題並通過不在 .env 文件中存儲mongo Uri的完整字符串來解決它。 相反，我只存儲了用戶和密碼

./config.env

DB_USER=youruser
DB_PASS=yourpassword

./app.js

mongoose.connect(`mongodb+srv://${process.env.DB_USER}:${process.env.DB_PASS}@cluster0.pm4ek.gcp.mongodb.net/CommentsDB?retryWrites=true&w=majority`)

Answer 2

當我從 Heroku var config 中的 DB_URL 中刪除引號時出現錯誤，但現在它給我帶來了另一個錯誤，即：

TypeError: Cannot read property 'db' of null 2020-05-05T10:21:40.450337+00:00 app[web.1]: at /app/router.js:12:31 2020-05-05T10:21:40.450355+00:00 app[web.1]: at Layer.handle [as handle_request] (/app/node_modules/express/lib/router/layer.js:95:5) 2020-05-05T10:21:40.450356+00:00 app[web.1]: at next (/app/node_modules/express/lib/router/route.js:137:13) 2020-05-05T10:21:40.450356+00:00 app[web.1]: at Route.dispatch (/app/node_modules/express/lib/router/route.js:112:3) 2020-05-05T10:21:40.450357+00:00 app[web.1]: at Layer.handle [as handle_request] (/app/node_modules/express/lib/router/layer.js:95:5) 2020-05-05T10:21:40.450358+00:00 app[web.1]: at /app/node_modules/express/lib/router/index.js:281:22 2020-05-05T10:21:40.450358+00:00 app[web.1]: at Function.process_params (/app/node_modules/express/lib/router/index.js:335:12) 2020-05-05T10:21:40.450359+00:00 app[web.1]: at next (/app/node_modules/express/lib/router/index.js:275:10) 2020-05-05T10:21:40.450359+00:00 app[web.1]: at Function.handle (/app/node_modules/express/lib/router/index.js:174:3) 2020-05-05T10:21:40.450359+00:00 app[web.1]: at router (/app/node_modules/express/lib/router/index.js:47:12) 2020-05-05T10:21:57.090036+00:00 app[web.1]: /app/node_modules/mongodb/lib/utils.js:725 2020-05-05T10:21:57.090047+00:00 app[web.1]: throw error; 2020-05-05T10:21:57.090048+00:00 app[web.1]: ^ 2020-05-05T10:21:57.090048+00:00 app[web.1]:

Answer 3

我從 docker-compose yml 文件中刪除了引號，它現在對我有用。

Answer 4

我遇到了同樣的問題， 這個鏈接幫助我解決了這個錯誤。

TLDR； 您應該刪除 mongo URI config var 上的雙引號