>     def setting_class_var
>       User.some_class_var = self
>       yield
>       User.some_class_var = nil
>     end
> end
> 
> My question is will this work properly while threading? I am unsure if
> rails does any kind of mutual exclusion. Thanks!

Yeah you'll want to use instance variables and avoid anything shared 
(like class variables) unless you mean it to be shared.
-=R
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