无法使用猫鼬连接到 mongodb 图集

Question

我需要帮助！！！ 我尝试使用我的连接字符串连接到 mongodb atlas，但我无法连接。 我不知道如何继续。 我有一个准系统应用程序。 我收到一个连接错误（一个 mongooseServerSelectionError）和一个未处理的 Promise Rejection Warning。

这是错误：

 connection error:  MongooseError [MongooseServerSelectionError]: connect ECONNREFUSED 127.0.0.1:27017
   at new MongooseServerSelectionError (/Users/jagnoorg/Documents/personal-projects/monkey-den/project2/node_modules/mongoose/lib/error/serverSelection.js:22:11)
   at NativeConnection.Connection.openUri (/Users/jagnoorg/Documents/personal-projects/monkey-den/project2/node_modules/mongoose/lib/connection.js:808:32)
   at Mongoose.connect (/Users/jagnoorg/Documents/personal-projects/monkey-den/project2/node_modules/mongoose/lib/index.js:333:15)
   at Object.<anonymous> (/Users/jagnoorg/Documents/personal-projects/monkey-den/project2/server/db/index.js:4:10)
   at Module._compile (internal/modules/cjs/loader.js:1157:30)
   at Object.Module._extensions..js (internal/modules/cjs/loader.js:1177:10)
   at Module.load (internal/modules/cjs/loader.js:1001:32)
   at Function.Module._load (internal/modules/cjs/loader.js:900:14)
   at Module.require (internal/modules/cjs/loader.js:1043:19)
   at require (internal/modules/cjs/helpers.js:77:18)
   at Object.<anonymous> (/Users/jagnoorg/Documents/personal-projects/monkey-den/project2/server/bin.js:33:10)
   at Module._compile (internal/modules/cjs/loader.js:1157:30)
   at Object.Module._extensions..js (internal/modules/cjs/loader.js:1177:10)
   at Module.load (internal/modules/cjs/loader.js:1001:32)
   at Function.Module._load (internal/modules/cjs/loader.js:900:14)
   at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12) {
 message: 'connect ECONNREFUSED 127.0.0.1:27017',
 name: 'MongooseServerSelectionError',
 reason: TopologyDescription {
   type: 'Single',
   setName: null,
   maxSetVersion: null,
   maxElectionId: null,
   servers: Map { 'localhost:27017' => [ServerDescription] },
   stale: false,
   compatible: true,
   compatibilityError: null,
   logicalSessionTimeoutMinutes: null,
   heartbeatFrequencyMS: 10000,
   localThresholdMS: 15,
   commonWireVersion: null
 },
 [Symbol(mongoErrorContextSymbol)]: {}
}
(node:9182) UnhandledPromiseRejectionWarning: MongooseServerSelectionError: connect ECONNREFUSED 127.0.0.1:27017
   at new MongooseServerSelectionError (/Users/jagnoorg/Documents/personal-projects/monkey-den/project2/node_modules/mongoose/lib/error/serverSelection.js:22:11)
   at NativeConnection.Connection.openUri (/Users/jagnoorg/Documents/personal-projects/monkey-den/project2/node_modules/mongoose/lib/connection.js:808:32)
   at Mongoose.connect (/Users/jagnoorg/Documents/personal-projects/monkey-den/project2/node_modules/mongoose/lib/index.js:333:15)
   at Object.<anonymous> (/Users/jagnoorg/Documents/personal-projects/monkey-den/project2/server/db/index.js:4:10)
   at Module._compile (internal/modules/cjs/loader.js:1157:30)
   at Object.Module._extensions..js (internal/modules/cjs/loader.js:1177:10)
   at Module.load (internal/modules/cjs/loader.js:1001:32)
   at Function.Module._load (internal/modules/cjs/loader.js:900:14)
   at Module.require (internal/modules/cjs/loader.js:1043:19)
   at require (internal/modules/cjs/helpers.js:77:18)
   at Object.<anonymous> (/Users/jagnoorg/Documents/personal-projects/monkey-den/project2/server/bin.js:33:10)
   at Module._compile (internal/modules/cjs/loader.js:1157:30)
   at Object.Module._extensions..js (internal/modules/cjs/loader.js:1177:10)
   at Module.load (internal/modules/cjs/loader.js:1001:32)
   at Function.Module._load (internal/modules/cjs/loader.js:900:14)
   at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12)
(node:9182) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:9182) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

这是我的代码：

我给出了要连接的 uri 的指示，通过 mongoose 设置连接，导出数据库并在app.js 中打开连接......

在db/index.js 中：

var mongoose = require('mongoose');
mongoose.Promise = global.Promise;
// const uri = require('../../keys.js').mongodb.dbURI;
mongoose.connect("mongodb://localhost/test", { useNewUrlParser: true, useUnifiedTopology: true});
// mongoose.connect(process.env.MONGODB_URL || uri, { useNewUrlParser: true, useUnifiedTopology: true});
var db = mongoose.connection;
db.on("error", console.error.bind(console, "connection error: "));

module.exports = db;

在app.js 中：

console.log('NODE_ENV :::', process.env.NODE_ENV);
if (process.env.NODE_ENV === 'PRODUCTION') {
    var app = require('./prod.app.js'); 
} else {
    var app = require('./dev.app.js');
}
var express = require('express');
var path = require('path');
var routes = require('./db/routes/index.js');
var http = require('http');
var favicon = require('serve-favicon');
var PORT = 3000;

/* 
 * shared code in production and development 
*/

// favicon - 3 ways - middleware, static, html 
app.use(favicon(path.join(__dirname, '../public/images/favicon.ico')));
// app.use('/favicon.ico', express.static(path.join(__dirname, '../public/images/favicon.ico')));
// app.use('images/favicon.ico', express.static(path.join(__dirname, '../public/images/favicon.ico')));

app.use(express.json());
app.use(express.urlencoded({ extended: true}));

// static files
app.use(express.static(path.join(__dirname, "../client")));
app.use(express.static(path.join(__dirname, "../public")));

// db - mongo
var db = require('./db/index.js');
db.once("open", function (err) {
    // console.log('db::: ', db);
    if (err) {
        return console.error(err);
    } else {
        console.log("Successfully connected to mongodb");
    }
})

// routes
app.use(routes); 

// serve index.html if can't find the route
app.use('*', function (req, res, next) {
    console.log("...serving index.html file from the public folder")
    res.sendFile(path.join(__dirname, '../public/index.html'));
});

// create server 
var server = http.createServer(app);
server.listen(PORT);
console.log(`server listening on post ${PORT}`);

谢谢你帮我调查这个

Answer 1

你的 app.js app.use(cors())有这行吗？

尝试删除此行并删除所有涉及 cors 的内容。

如果这不起作用，请检查 MongoDB Atlas 中网络访问内的 IP 白名单并添加您当前的 IP 或写入此 0.0.0.0/0 以允许所有 IP。

Answer 2

检查您的 IP 是否由 mongodb atlas 启用。 您应该允许从 mongodb atlas 访问您的计算机 IP 地址。 转到网络访问（左侧栏）输入您的 IP 或输入 0.0.0.0 以访问所有 IP。

Answer 3

在连接 ip 地址的 mongoDB ATLAS 中将您当前的 ip 地址设置为 0.0.0.0/0。 它将允许连接所有IP地址。

Answer 4

尝试添加 Atlas 提供的 url 以连接您的应用：

mongoose.connect("<URLprovidedByAtlas>", { useNewUrlParser: true, useUnifiedTopology: true});

Answer 5

兄弟更新mongodb atlus中的（ip）地址。它会帮助你

Answer 6

尝试检查您的互联网连接，以及您的 IP 地址是否正确。

https://github.com/Automattic/mongoose/issues/8180#issuecomment-552161146

Answer 7

这对我有用。 我首先将 ip 地址更改为 0.0.0.0/0 并删除了 app.use(cores())。 然后我下载了mongoDB指南针并连接到数据库。 之后在 index.js 中使用了相同的 URI。 在 URI 和 Compass 中输入密码是有区别的。 在指南针中，您不需要对密码进行编码（如果您有特殊字符）。 如果您使用指南针连接并将该链接粘贴到 index.js 中，则不需要对密码进行编码。

Answer 8

检查您是否通过 ./mongod 在终端中启动了数据库