On the Juhana Rasanen's blog today there's a new tutorial showing you how to use the popular NoSQL database MongoDB with an application written in the CodeIgniter framework.

Considering using MongoDB instead of a SQL DB in your next CodeIgniter project? Well, we were and decided to take a stab at it, and fairly soon discovered that it is pretty straightforward. Even more so, if you don’t try to use CI Active Record, but use native PHP Mongo interface to store and query your data. That suits our case, as we are planning to access the data mostly from Javascript UI over Ajax - in which case it is quite simple to just get the document from Mongo as an array and then serialize it to the UI using PHP JSON functions.

He talks about his extension of CI_Session to handle the session management and user authentication pulled from the MongoDB and used as normal in your application. He's made the package available for for download if you'd like to see how its implemented (there's a README for installation instructions).