the downside

Hell what do you mean ? Application Error ? That’s not plenty of details. I am new. Give me more.
After moving stuff around, removing a Model class, introducing a new one i kept getting this “Application Error” Message in my Browser.

The WEBBrick console did not show more information…

Taking a look at the log files in MY_APP/log revealed the cause:

Session contains objects whose class definition isn’t available.
Remember to require the classes for all objects kept in the session.
(Original exception: uninitialized constant Permission [NameError])

Hmmm…. yes… i removed an Model class which was previously stored in the session. After all this is my Playground. I remove as many classes as i wish. Dare you not to serve my webpages. Stupid WEBBrick.

The easy solution to this problem ?

just go to MY_APP/tmp/sessions and do a rm *

Tada… (perhaps there is a more subtle way of handling this… i don’t know)