From: "Florian Groß" <florgro@...>
Date: 2006-06-05T20:36:32+09:00
Subject: Re: isset kinda function

Alex Copot wrote:

> Well, I have something like this
> 
>     if session[:cart][product_id] > 1
>       session[:cart][product_id] = session[:cart][product_id] + 1
>     else
>       session[:cart][product_id] = 1
>     end
> 
> But it doesn't work. I get this.
> 
> You have a nil object when you didn't expect it!
> You might have expected an instance of Array.
> The error occured while evaluating nil.[]

Seems like session[:cart] is nil. You can just do

if session[:cart] then
   ...
end

And things will work correctly.

What you proably want is to initialize session[:cart] to an object, 
though. You can do that like:

session[:cart] ||= default

Hope this helps.

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