错误：无法初始化客户端 | mongo-connect 快速会话

问题描述

尝试在 mongodb 上保存会话时出错。这是我的代码..

const express = require("express");
const session = require("express-session");
const MongoStore = require("connect-mongo").default;
const app = express();

let sessionoptions = session({
  secret: "JavaScript is cool",store: MongoStore.create({ client: require("./db") }),resave: false,saveUninitialized: false,cookie: { maxAge: 1000 * 60 * 60 * 24,httpOnly: true },});

app.use(sessionoptions);
const router = require("./router");
app.use(express.urlencoded({ extended: false }));
app.use(express.json());
app.use(express.static("public"));
app.set("views","views");
app.set("view engine","ejs");

app.use("/",router);

module.exports = app;

和 db.js

const dotenv = require("dotenv");
dotenv.config();
const mongodb = require("mongodb");

mongodb.connect(
  process.env.CONNECTIONSTRING,{ useNewUrlParser: true,useUnifiedTopology: true },(err,client) => {
    module.exports = client;
    const app = require("./app");
    app.listen(process.env.PORT);
  }
);

错误就在这里..

Assertion Failed: You must provide either mongoUr|clientPromise in options
/home/irfan/Desktop/Brad_Sciff/Complex_App/node_modules/connect-mongo/build/main/lib/MongoStore.js:121
            throw new Error('Cannot init client');
            ^

    Error: Cannot init client
        at new MongoStore (/home/irfan/Desktop/Brad_Sciff/Complex_App/node_modules/connect-mongo/build/main/lib/MongoStore.js:121:19)
        at Function.create (/home/irfan/Desktop/Brad_Sciff/Complex_App/node_modules/connect-mongo/build/main/lib/MongoStore.js:137:16)
        at Object.<anonymous> (/home/irfan/Desktop/Brad_Sciff/Complex_App/app.js:9:21)
        at Module._compile (internal/modules/cjs/loader.js:778:30)
        at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
        at Module.load (internal/modules/cjs/loader.js:653:32)
        at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
        at Function.Module._load (internal/modules/cjs/loader.js:585:3)
        at Module.require (internal/modules/cjs/loader.js:692:17)
        at require (internal/modules/cjs/helpers.js:25:18)

我尝试从 const MongoStore = require("connect-mongo").default 更改为 const MongoStore = require("connect-mongo")(session)

但是显示错误..

const MongoStore = require("connect-mongo")(session);
                                           ^

TypeError: require(...) is not a function
    at Object.<anonymous> (/home/irfan/Desktop/Brad_Sciff/Complex_App/app.js:4:44)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (internal/modules/cjs/helpers.js:25:18)
    at mongodb.connect (/home/irfan/Desktop/Brad_Sciff/Complex_App/db.js:10:17)
    at /home/irfan/Desktop/Brad_Sciff/Complex_App/node_modules/mongodb/lib/utils.js:693:5

使用 Connect-mongo 4.2，express-session 1.17.1 express 4.17.1 mongodb 3.6.4

不知道我错过了什么。

请帮忙。

提前致谢。

伊尔凡。

解决方法

看来 connect-mongo 最近已更新。我今天也遇到了这个问题，这是我解决它的方法。

过去如何：

const session = require('express-session');
const MongoStore = require('connect-mongo')(session);

app.use(
  session({
    ...options
    store: new MongoStore({ mongooseConnection: mongoose.connection  }),})
);

现在怎么样了：

const session = require('express-session');
const MongoStore = require('connect-mongo').default;

app.use(
  session({
    store: MongoStore.create({ mongoUrl: process.env.MONGO_URI }),...options
  })
);

尝试将您的连接字符串传递给 mongoURL 而不是 client，看看是否有帮助。

您可以阅读有关 connect-mongo in their docs 的更多信息。

,

以下对我有用。

const mongoose = require("mongoose");
const session = require("express-session");
const MongoStore = require("connect-mongo");

const url = 'mongodb://localhost/mydb';
mongoose.connect(url,{ useNewUrlParser: true,useCreateIndex: true,useUnifiedTopology: true,useFindAndModify: true });
const connection = mongoose.connection;

connection.once('open',() => {
    console.log("database connected successfully...");
}).catch(err => {
    console.log("connection failed...");
});

// session store

let store = new MongoStore({
   mongoUrl: url,collection: "sessions"
});

 // session config

 app.use(session({
   secret: process.env.COOKIE_SECRET,resave: false,store: store,saveUninitialized: false,cookie: { maxAge: 1000 * 60 * 60 * 24 },// 24 hours
 }));

,

这是最新的解决方案

添加这一行

第一

var session = require('express-session');
var MongoStore = require ('connect-mongo');

第二

app.use(session(
      {
        secret: '**something** like mysupersecret',store: MongoStore.create({ 
          mongoUrl: '**your url**like mongodb://localhost/test-app'}),}));