How do I change filename of the file?

I’d like to change the file name to other that’s send as a property of the data object, here’s the json of the file:

{ fieldname: 'file',
  originalname: 'db.pdf',
  encoding: '7bit',
  mimetype: 'application/pdf',
  destination: './client/public/docs/transactions/',
  filename: '8a3fe7cb7369d9cffa8e17b162ec3d6b',
  path: 'client\\public\\docs\\transactions\\8a3fe7cb7369d9cffa8e17b162ec3d6b',
  size: 9179145 }

Client side upload with ng-file-upload:

Upload
    .upload( {
        url: '/api/v1/upload',
        data: {
            file: vm.pdf,
            new_name: vm.new_pdf_name //This is the name I want for the file
        }
    } )
    .then(
        function ( response ) { ... }
    );

I’m using diskStorage but the request of filename property function doesn’t receive new_file_name property…

var storage = multer.diskStorage(
    {
        destination: './uploads/',
        filename: function ( req, file, cb ) {
            //req.body is empty...
            cb( null, file.originalname );
        }
    }
);

How could I send the new_file_name through that req.body?

[LinusU]

Yes that is the expected behaviour, the filename function is called whenever a file is detected on the wire. It needs to run before the file is actually consumed since it determines where to save it.

Your request from the client looks like this:

<header> | file | new_file_name
           ^ filename function fired

You need to send it as such:

<header> | new_file_name | file
                           ^ filename function fired

[LinusU]

If req.body is empty, it means that the client sent the file before sending the new_file_name field. There is nothing we can do about it in multer.

This has come up a number of times before, e.g. #146 where the workaround is further outlined.