gridfs-stream createWriteStream not uploading data

Question

I am using following code to create a file in mongodb. I get no error. But when i chech my Test database nothing is seen there uploaded. What am i doing wrong?

var GridStrm = require('gridfs-stream');
    console.log('Logo Upload');

    var conn = mongoose.createConnection('localhost', 'Test', 27017);

    var gfs = GridStrm(conn.db, mongoose.mongo);       

    var writeStream = gfs.createWriteStream('file.txt');
    fs.createReadStream('d:\\somepath').pipe(writestream);

I get the error Error: EISDIR, read.

I got new error :-

events.js:72
        throw er; // Unhandled 'error' event
              ^
Error: Cannot determine state of server
    at canCheckoutReader 

I further tried the following code :-

req.pipe(gfs.createWriteStream({
        filename: 'test'
    }));
    res.send("Success!");

But still no result.

Answer 1

A more minimal example

var mongoose = require('mongoose');
var Grid = require('gridfs-stream');
var fs = require('fs');

var conn = mongoose.createConnection('localhost', 'test', 27017 );

conn.once('open', function() {

    var gfs = Grid( conn.db, mongoose.mongo );

    var source = fs.createReadStream('file.txt');

    var target = gfs.createWriteStream({
        filename: 'file.txt'
    });

    source.pipe(target);

});

This puts into the collection:

> db.fs.files.find()
{
  "_id" : ObjectId("531470dc8b79087430b2e38d"),
  "filename" : "file.txt", 
  "contentType" : "binary/octet-stream",
  "length" : 138,
  "chunkSize" : 262144,
  "uploadDate" : ISODate("2014-03-03T12:09:00.896Z"),
  "aliases" : null,
  "metadata" : null,
  "md5" : "87be58f21745384bcd13743bde9ae8fb"
}

So your problem was:

1. When you first posted you had a stream but you were not using it.
2. You thought that was where you told it what file to use

In all the gridFS methods the filename is just a label that is sent to the server. Other methods are used to work with real files. So if you are still confused, try the code then change this line afterwards:

    var target = gfs.createWriteStream({
        filename: 'dont-exist.txt'
    });

Your same file content will be used, just with a new label on the server.