GridFS Node Example

gistfile1.js

var mongoose = require('mongoose'),
    db = mongoose.connection.db,
    GridStore = mongoose.mongo.GridStore,
    stringifyObject = require('stringify-object'),
    debug = require('debug')('myApp:MongoDB-GridFS');

var collectionRoot = "TestArchive";
var defaultQuery = {
    "metadata.author": "Joel A. Bair",
    "filename": "Summer Vacation.MOV"
};

module.exports = function(query, callback) {
	db.collection(collectionRoot + '.files', {strict:true}, function(err, files) {
		if (err) debug(err) & return callback(err, null);

		query = query || defaultQuery;
		
		// .files collection
		files.findOne(query, function(err, file) {
			if (err) debug(err) & return callback(err, null);
	
			// .chunks collection
			var gs = GridStore(db, file._id, file.filename, "r", gsOptions);

			gs.open(function(err, gs) {
				if (err) debug(err) & return callback(err, null);

				file.stream = gs.stream;
	
				gs.seek(0, function(err, gs) {
					if (err) debug(err) & return callback(err, null);

					gs.read(function(err, fileData) {
						if (err) debug(err) & return callback(err, null);

						file.buffer = fileData;

						if (callback) {
							callback(null, file);
						}
					});
				});
			});
		});
	});
};