hello_mongo

//  An Introduction To Node.js And MongoDB
//  By Elliot Bonneville
//  May 22nd, 2014
//  http://www.smashingmagazine.com/2014/05/22/detailed-introduction-nodejs-mongodb/

var http = require("http"),
    mongojs = require("mongojs");

//  NOTE from the transcriber: The original tutorial assigned variable db to the
//  execution of mongojs.connect(), however as of today (2015-06-21) it appears
//  the correct call is simply mongojs().  I'm completely new to this, though,
//  I could be wrong, but mongojs.connect() did not work for me.  I found this
//  other approach here:
//
//  http://blog.nodejitsu.com/npmawesome-mongojs-a-driver-to-closer-match-mongodb-api/
var uri = "mongodb://demo_user:demo_password@ds027769.mongolab.com:27769/demo_database",
    db = mongojs(uri, ["demo_collection"]);

var server = http.createServer(requestHandler);

function requestHandler(request, response) {

    response.writeHead(200, {"Content-Type": "text/html"});

    db.demo_collection.find(
        {"color": "red"},
        function(err, records) {

            if (err) {
                console.log("There was an error executing the database query.");
                response.end();
                return;
            }

            //  NOTE from the transcriber: I replaced paragraphs with list-items
            //  because I'm a jerk.  Hey, you're looking at my actual
            //  walk-through of this tutorial.  Everyone likes to customize
            //  their tutorial results, right?
            var html = "<h2>Vehicles with a red finish</h2>\n<ol>\n",
                i = records.length;

            while (i--) {
                html += "<li><b>Name:</b> "
                     + records[i].name
                     + " <br/><b>Number of wheels:</b> "
                     + records[i].wheels
                     + " <br/><b>Color:</b> "
                     + records[i].color
                     + "</li>\n";
            }

            html += "</ol>\n";

            //  NOTE from the transcriber: I wanted to see everything that had
            //  had been returned, so I employed JSON.stringify to visualize
            //  the records array in a preformatted text block.
            html += "<pre>";
            html += JSON.stringify(records, null, "\t");
            html += "</pre>";

            response.write(html);
            response.end();
        }
    );
}

server.listen(8888);
console.log("Server listening on port 8888.");

Thanks a lot for making it work.