How to return id of uploaded file (upload with multer in nodejs express app)

Question

I have an MEAN stack app and trying to upload file with multer. Upload is working fine the only problem is I want to return uploaded file's id.

//multer settings for single upload
var upload = multer({ storage: storage }).single('file');

app.post('/upload', upload, function (req, res) {
//// ????? What to return and how? 
});

I'm subscribed to this post into angular2 service. Thank you for help.

Answer 1

var multer = require('multer');

// storage for upload file.
 var storage  = multer.diskStorage({
     destination: function (req, file, callback) {
     callback(null, './file');
  },
  filename: function (req, file, callback) {
     callback(null, file.originalname);
  }
 });

 var Upload = multer({
    storage: storage 
 }).any('file');


 router.post('/upload', postData);

function postData(req, res) {
 Upload(req, res, function (error) {
    if (error) {
        res.status(400).send(error);
    }
    var obj = {};
    obj.file = req.files.filename;
    //file is getting stored into database and after it successfully stored 
    //into database it will return you Id
    db.create(obj, function (err, data) {
                        if (err) {
                            res.send('error');
                        }
                        if (!data) {
                            res.send('Error');
                        } else {
                            console.log('file upload');
                            res.send(data._id);
                        }
                    });
            });
       }

to return Id you should have to store reference somewhere in database and after that you will return id to Angular2