Unhandled rejection MongoError: cannot connect to server in MongoDB

Question

I got Unhandled rejection MongoError: cannot connect to server when run my meanjs project.

Previously was running fine but when update nodejs 5.11.1, mongodb 3.2.6,"mongoose": "^4.4.16" and "connect-mongo": "^1.1.0", then this error getting.

Unhandled rejection MongoError: cannot connect to server at Collection.listIndexes (/home/shaishab/Project/Open-Source/BS-Commerce/node_modules/mongodb/lib/collection.js:1750:11) at indexInformation (/home/shaishab/Project/Open-Source/BS-Commerce/node_modules/mongodb/lib/db.js:1625:25) at Db.indexInformation (/home/shaishab/Project/Open-Source/BS-Commerce/node_modules/mongodb/lib/db.js:1589:44) at ensureIndex (/home/shaishab/Project/Open-Source/BS-Commerce/node_modules/mongodb/lib/db.js:1082:8) at Db.ensureIndex (/home/shaishab/Project/Open-Source/BS-Commerce/node_modules/mongodb/lib/db.js:1058:44) at ensureIndex (/home/shaishab/Project/Open-Source/BS-Commerce/node_modules/mongodb/lib/collection.js:1820:13) at Collection.ensureIndex (/home/shaishab/Project/Open-Source/BS-Commerce/node_modules/mongodb/lib/collection.js:1808:44) at MongoStore.setAutoRemoveAsync (/home/shaishab/Project/Open-Source/BS-Commerce/node_modules/connect-mongo/src/index.js:123:40) at MongoStore.handleNewConnectionAsync (/home/shaishab/Project/Open-Source/BS-Commerce/node_modules/connect-mongo/src/index.js:116:18) at MongoStore (/home/shaishab/Project/Open-Source/BS-Commerce/node_modules/connect-mongo/src/index.js:95:26) at module.exports (/home/shaishab/Project/Open-Source/BS-Commerce/config/express.js:101:10) at Object. (/home/shaishab/Project/Open-Source/BS-Commerce/server.js:31:38) at Module._compile (module.js:413:34) at Object.Module._extensions..js (module.js:422:10)

in config file code

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

var db = mongoose.connect('dbUrl');
app.use(session({
        saveUninitialized: true,
        resave: true,
        secret: config.sessionSecret,
        store: new MongoStore({
            db: db.connection.db,
            collection: config.sessionCollection
        })
}));

Can any one help me ?

Answer 1

Finally I got where error occurred!! I post this answer because of it may will help others.

Problem occurred when update mongoose and connect-mongo version.

need to update:

MongoStore = require('connect-mongo')(session)

and

app.use(session({
        saveUninitialized: true,
        resave: true,
        secret: config.sessionSecret,
        store: new MongoStore({
            mongooseConnection: db.connection,
            collection: config.sessionCollection
        })
    }));

main problem was in MongoStore({db: db.connection.db instead of use

db: db.connection.db

now using

mongooseConnection: db.connection

that solved my problem :)