From: Brian Candler <lists@...>
Date: 2012-07-31T21:34:26+09:00
Subject: Re: How to test whether a session variable has a particular key

Doug Jolley wrote in post #1070702:
>> are you asking a question about Rails?
>
> No.  My question relates to CGI::Session.

Looking at the source code, it's pretty icky (I'm looking at ruby 
1.8.7p357, and I see for example it sets @write_lock = true at one 
point, but never uses it subsequently)

Anyway, if you can avoid storing nil values, then I'd just use

  if session[:key]
    ... do something
  end

As has been pointed out above, hardly anyone uses CGI these days; with 
any non-trivial code the overhead of loading up libraries and 
establishing fresh database connections is too high.

Rack::Session::XXX is probably what you want.

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