Only name is storing in mongoose database

I have write the following code, code is working fine except it stores only name field in the mongoose schema.

var express = require('express');
var router = express.Router();
var bodyParser = require('body-parser');
var mongoose = require('mongoose');
var urlencodedParser = bodyParser.urlencoded({ extended: false });
mongoose.Promise = Promise;

mongoose.connect('mongodb://localhost/test');

var Schema = mongoose.Schema;

var studentSchema = new Schema({ name: String, department: String, rollno: Number, cgpa: Number });

var studentData = mongoose.model('studentData',studentSchema);

 router.get('/student', function(req, res, next) {
 res.render('student_form.ejs');
 });

  router.post('/student', urlencodedParser, function(req, res){
  console.log(req.body);
  var  name = req.body.name;
  var dept = req.body.department;
  var rollno = req.body.rollno;
  var cgpa = req.body.cgpa;
  var content = new studentData(req.body);
   content.rollno = rollno;
   content.name = name;
   content.department = dept;
   content.cgpa = cgpa;

    content.save(function(err, saveObject){
    if(err){
      //  return handleError(err);
      console.log(err);
    return  res.status(500).send();
    } else {
       res.json(saveObject);
    }
     });
    });

    router.get('/database', function(req, res) {
    var logvalue = req.headers['log'];
    if(logvalue &&  logvalue == 'info') {
    console.log("request received for /database");
    }
    var select = req.query.select;

    studentData.find({}, function (err, result) {
    if (err) {
    res.status(500).send();
     } else {
    if(result.length == 0) {
      var responseObeject = undefined;
      if(select && select == 'count') {
        responseObject = {count: 0};
      }
      res.status(404).send(responseObject);
      } else {
      var responseObject = result;
      if(select && select == 'count') {
        responseObject = {count: result.length};
      }
      res.send(responseObject);
       }
      }
      })
      });

      module.exports = router;

via Rohit Goyal