错误：无法初始化客户端 | mongo-connect 快速会话

我在尝试在 mongodb 上保存会话时遇到错误。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)

我试图改变const MongoStore = require("connect-mongo").default to const MongoStore = require("connect-mongo")(会话)

但错误显示..

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。

Irfan.

所以看起来像connect-mongo最近已更新。我今天也遇到了这个问题，这是我解决的方法。

以前是怎样的：

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：

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到mongoURL代替client看看是否有帮助。

您可以阅读有关 connect-mongo 的更多信息在他们的文档中 https://www.npmjs.com/package/connect-mongo.