Unduhan file tidak berfungsi dengan nodejs gridfs

Anda mungkin perlu memeriksa nilai Anda di params. Tapi semoga ini dekat sampel minimal memberikan bantuan:

Perbarui

Dan itu membantu, karena menyoroti bahwa Anda sedang mencari _id sebagai nama file. Sebaliknya Anda harus melakukan ini:

.createReadStream({
    _id: req.param('filename')
})

jika tidak

.createReadStream({
    _id: mongoose.Types.ObjectId(req.param('filename'))
})

Sejak _id field berbeda dengan nama file

app.js

var express = require('express');
var routes = require('./routes');
var http = require('http');
var path = require('path');

var app = express();

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

var conn = mongoose.createConnection('mongodb://localhost/mytest');

conn.once('open', function() {
    console.log('opened connection');
    gfs = Grid(conn.db);

    // all environments
    app.set('port', process.env.PORT || 3000);
    app.use(express.logger('dev'));
    app.use(app.router);

    // development only
    if ('development' == app.get('env')) {
        app.use(express.errorHandler());
    }

    app.get('/', routes.index);

    http.createServer(app).listen(app.get('port'), function(){
        console.log('Express server listening on port ' + app.get('port'));
    });

});

routes/index.js

exports.index = function(req, res){

    res.set('Content-Type', 'image/jpeg');
    gfs.createReadStream({
        filename: 'receptor.jpg'
    }).pipe(res);

};