@foo is instantiated from the session, by @foo =
session[:foo] but this
doesn’t cause the error. In fact I can use @foo in views and other
ways and no error occurs.I really have no idea what’s going on with this.
Try using breakpoint to inspect @foo
http://wiki.rubyonrails.com/rails/pages/HowtoDebugWithBreakpoint
can tell you lots.
As a general “why doesn’t my blah work” response have a look at your
code running using breakpoint. I’m guessing from the noise on the list
that breakpoint would be the most underutilized tool in Rails.
Ross