Upload and redirect page using multer - node.js

Question

I am having a problem to redirect the page after a successful file upload using multer. With the file upload i am also saving some text into the database. Here's my code.
Question :
When the file and the contents are saved in the DB how can I redirect the page to a new URL ?
I am currently using res.redirect('product/item'); but nothing happens. I also tried using res.render, but the page did not redirect.
Multer method to upload a file to Amazon S3
var upload = multer({
storage: multerS3({
s3: s3,
bucket: 'nameofthebucket',
metadata: function (req, file, cb) {
var ext = file.originalname.split('.').pop();
cb(null, {fieldName: 'file.fieldname' + '.' + ext});
},
filename: function(req,file,cb){
var ext = file.originalname.split('.').pop();
cb(null, Date.now() + '.' + ext);
},
key: function (req, file, cb) {
var ext = file.originalname.split('.').pop();
cb(null, Date.now() + '.' + ext);
}
})
})
var upload = upload.array('fileup', 10);
The code responsible to upload the file and the content
router.post('/uploadfileandcontent',function(req,res,next){
upload(req,res,function(err) {
if(err) {
} else {
saveRecordsToDB(req, function(err,data){
if (err) {
res.redirect('/errorpage');
} else {
res. redirect('product/item');
}
});
}
});
});
Function that saves records to DB and makes the callback
function saveRecordsToDB (req, callback){
var args = {
data: {
"name" : req.body.name, //
"age" : req.body.age
},
headers: { "Content-Type": "application/json" }
};
// registering remote methods
client.registerMethod("postMethod", "http://url/uploadfileandcontent", "POST");
var req =client.methods.postMethod(args, function (data, response) {
callback(null, 'success?');
});
req.on('error', function (err) {
console.log('error');
});
}
Note: I also made use of NODE REST CLIENT to send http request.

Answer 1

This should work. Tell me if it doesn't.
router.post('/uploadfileandcontent', function(req,res,next){
upload(req,res,function(err) {
if(err) {
res.send('Error while uploading.');
}
saveRecordsToDB(req, function(err,data){
if (err) {
console.log(err);
req.flash('error', { msg: 'Error while saving data.' }); // Flash message -> need to configure your template to show it
}
// Saved to DB
req.flash('success', { msg: 'Saved' });
res.redirect('/product/item'); // go to this page
});
});
});
UPDATE
You will need to include const flash = require('express-flash'); to use flash message. Then you can load it to your app like this: app.use(flash());. The app is express loaded like this: const app = express();.
In your HTML you will access it in an array. Example using Jade:
//success
if messages.success
for success in messages.success
div #{success.msg} // Saved
//Error
if messages.errors
for error in messages.errors
div #{error.msg} // Error while saving data.