node.js - how to set read Preference secondary using mongoclient in nodejs mongodb driver? -

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i using mongodb replica set. have following config :

{ "members": [       {         "host": "db1.example.com",         "port": "27017"       },       {         "host": "db2.example.com",         "port": "27017"                   }     ]     }

i connecting db name myapplicationdb using following nodejs code :

using mongodb driver version 1.4.38.

var mongoclient = require('mongodb').mongoclient; var server = require('mongodb').server;  var url = 'mongodb://';     var options = {         server: {             slaveok: true,             readpreference: server.read_secondary,             socketoptions: {"connecttimeoutms": 30000}         },         db: {             readpreference: server.read_secondary         },         replset: {             rs_name: "replicaname",             readpreference: server.read_secondary         }     }     members.foreach(function (member) {         url = url + member.host + ':' + member.port + ','     });     url = url.substring(0, url.length - 1);     url += '/' + "myapplicationdb";     mongoclient.connect(url, options, function (err, db) {     console.log("db >>>>>>>>", db);  });

i want set read preference secondary.

but read operations executing on primary db. how set ?

this code solve problem : 

var mongoclient = require('mongodb').mongoclient; var server = require('mongodb').server;  var url = 'mongodb://'; var options = {     //server: {     //    slaveok: true,     //    readpreference: server.read_secondary,     //    socketoptions: {"connecttimeoutms": 30000}     //},     //db: {     //    readpreference: server.read_secondary     //},     //replset: {     //    rs_name: "replicaname",     //    readpreference: server.read_secondary     //} } members.foreach(function (member) {     url = url + member.host + ':' + member.port + ',' }); url = url.substring(0, url.length - 1); url += '/' + "myapplicationdb"; url = url + "?replicaset=replicaname&readpreference=secondarypreferred&connecttimeoutms=30000" mongoclient.connect(url, options, function (err, db) {      console.log("db >>>>>>>>", db);  });

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