From: Joel Pearson <lists@...>
Date: 2013-01-19T05:58:41+09:00
Subject: Re: Adding file directory automatically

"files[item" isn't valid. "files[item]" would be valid code...

It's case-sensitive, so maybe you have an uppercase string and you're 
trying to compare it to a lowercase one? You'd get "nil" if your hash 
doesn't contain the key you're entering.

Test that the hash contains the string and fail with a descriptive error 
if the conditions aren't right. Like this:

if files[item].nil?
fail TypeError, "item is not in hash: #{item.inspect}\n#{files.keys}"
end

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