Session error in rails 1.1

Rails
1

I keep getting this error in rails 1.1, does anybody know what it means?
My
site will be working fine, i do some more development, get a parse
error,
and then all of a sudden the page 404’s with the following error

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 BigDecimal [NameError])

Any ideas here ? Clearing all the sessions and cookies brings
everything
back to normal… not sure whats going on. This is on Rails 1.1, Linux,
Ruby
1.8.4, Postgres

thanks
adam

2

You have changed your model since your sessions were created. This
causes a mismatch and and the error. Each time you change your model or
database your sessions will no longer be valid. That’s why clearing
them fixes the problem.

3

Thanks for the explanation. However my model and database (column
definitions) were not changed here. Anything else that would cause
this?
All that happened was i had a parse error in an rhtml page, fixed it, i
reloaded and then got this and wouldnt go away.

adam

4

I’m not sure. I know that rails will die if you try to access an object
in your session that rails knows nothing about. What are you storing in
your session?

5

Adam D. wrote:

Thanks for the explanation. However my model and database (column
definitions) were not changed here. Anything else that would cause
this?
All that happened was i had a parse error in an rhtml page, fixed it, i
reloaded and then got this and wouldnt go away.

adam

This looks relevant:

http://wiki.rubyonrails.org/rails/pages/HowtoAvoidSessionRestoreError

6

hmm nice post, that does appear to be very relevant.