Dynamically changing destination folder name

Is it possible to dynamically change the destination folder name depending on the field name? I made a quick test which failed

app.use(multer({
  dest: './uploads/',
  rename: function (fieldname, filename) {
      if(fieldname == 'avatar_file'){
          return filename.replace(/\W+/g, '-').toLowerCase() + Date.now()
      } else {
          return 'avatars/' + filename.replace(/\W+/g, '-').toLowerCase() + Date.now()
      }
  }
}))

Thanks

[AndrewKralovec]

Why not just create a storage script that changes the directory dynamically ? Example of code i use to achieve this .

var multer = require('multer'); //  middleware for handling multipart/form-data,
// Constructor 
module.exports = function (name) {
    try {
        // Configuring appropriate storage 
        var storage = multer.diskStorage({
            // Absolute path
            destination: function (req, file, callback) {
                callback(null, './uploads/'+name);
            },
            // Match the field name in the request body
            filename: function (req, file, callback) {
                callback(null, file.fieldname + '-' + Date.now());
            }
        });
        return storage;
    } catch (ex) {
        console.log("Error :\n"+ex);
    }
}

[prabhud9468]

Dynamically changing destination folder name is done by using formidable and fs

var formidable = require(‘formidable’); var fs = require(‘fs’);

var initial_path = "D:/Files/";
var path=""; //dynamically created path will be stored at runtime
new formidable.IncomingForm().parse(req)
.on('field', (name, field) => {
  //field is an value of dynamic creation folder name
    path = init_path+field+"/";
    console.log(path); //Dynamic path is going to create
    fs.mkdir(path, { recursive: true }, (err) => {
        if (err) throw err;
    });
})
.on('fileBegin',(name, file) => {
    console.log(file.name);
    var a = file.name;
    var b = a.split('.');
    var fname = b[0].replace(/\s/g, '');
    file.path = path + fname+"."+b[1];
    file_path = file.path;
    savedImagePath = file_path.substring(1);
})
.on('file', (name, file) => {
    console.log('Uploaded ' + file.name);
})