Skip to main content

Ruby on Rails: How to load session objects into console

This took a little bit of poking around, so I decided to post it here.

Basically I was tracking down a bug, which resulted in a corrupt object (cart) in the web session. So I thought, it would be nice to play with this object in the console to see what's up... But how do I get it in there?

There may be a more elegant way to do this but here is how I got it to load:
  1. Look in tmp/sessions and find the most recent file (ls -alrt on UNIX). Let's say the file is called 'tmp/sessions/ruby_sess.8eb9614a7e4e1e3b'
  2. Open console and type:
    >> session = Marshal.load(File.open('tmp/sessions/ruby_sess.8eb9614a7e4e1e3b'))
    => {"hash"=>{:cart=...
    >> cart = session["hash"][:cart]
    ....
    
    In this case I was trying to access a cart object in the session, which was placed in the session with:session[:cart] = Cart.new
That's it!

Comments

Anonymous said…
What if you store the session in the DB?
Anonymous said…
AR Session Store:

Find the session id from the cookie and then Session.find_by_id(:my_session_id)
LemmingJoel said…
CGI::Session::ActiveRecordStore::Session.find_by_session_id(session_id)

Popular posts from this blog

Car or Auto Make-Model-Year Database : For Breakfast

Make Model What?If you like me were tasked with loading a database of recent car makes/models/years, you would start by looking on the web and seeing if someone else just has it out there, readily available, hopefully for free, but perhaps for a tiny nominal fee.?If only it was that simple... I looked and looked, and couldn't find anything that would fit the above requirements. So I thought, who would know about US car models better than Kelly Blue Book? So I went on their site, and sure enough they have a javascript file that lists all known to them makes and models of used cars. Since the file is public, I figured it's not really "evil" if I scrape and parse it for my own benefit. Disagree? Have a better source? Then leave a comment.Anyway, to cut the long story short, I'm hoping to save a day or so to someone else who may, like me, be looking for this information. The ruby module shown below retrieves and parses the javascript from KBB site into a Ruby da…

Rails3 and The Inevitable Fragmentation

I remember one of the early talks at the Canada On Rails in 2006 had a slide showing how many books one needs to read to be able to write web applications in Rails, versus Java.Of course Java side had about 10 books: Java SE, Java EE, Hibernate, Struts/Tiles/JSF, WebServices, Ant, Maven, Eclipse, JUnit, etc, etc.The Rails slide proudly showed the now hopelessly outdated "Agile Web Development With Ruby on Rails", 1st edition. Those were the times. Back then, during my work for Blurb.com myself and three other engineers managed to learn ruby, rails and build a fully functional e-commerce site in about 3 months. I was blown away by the productivity gains compared to Java, where months could be spent laying out the project, and creating all necessary infrastructure for builds, deployment, automated testing with or without the database, etc.Fast-forward to 2010. We are on a brink of Rails3 release, and oh boy, has the landscape changed since back then. I would argue that in s…

Why I Like PostgreSQL

Today I gave a short presentation at work about PostgreSQL, and why I much prefer it to MySQL.

PostgreSQL vs MySQL: Eternal Battle
I may be misreading this, but it seems that there is a recent trend within startups to move away from MySQL, probably thanks to folks like Heroku on one side (who use PostgreSQL to the extreme, and help and contribute to it's development), vs folks like Oracle on the other side, tainting the "open source pureness" of MySQL :)

At my work we currently use a mid-sized MySQL 5.1 Percona instance, which is holding up quite well I must admit. Both PostgreSQL and MySQL have definitely converged to cover most features that people want, but my leaning is still towards PostgreSQL. I just agree with it's focus on data integrity, recovery, constraints, extensibility, while some of the early decisions in MySQL's design do not agree with me at all (like truncating long strings, 1/0 instead of booleans, ambiguous group by, etc). I think that data …