From: Brian Candler <b.candler@...>
Date: 2009-01-27T19:51:43+09:00
Subject: Re: Help on Directory Iteration

Newb Newb wrote:
> folder structure would be ChatHistory has one folder like  2009-01-23
> has two folder namely test and user these two folders contain 2  files
> each.

You can get a list of all files and subdirectories under a subdirectory 
like this:

  Dir["ChatHistory/2009-01-23/**/*"]

Note: if you are inserting a value from a parameter, you should sanitise 
it first. At least remove /../, although it's safest to allow only valid 
values like this:

  date = params[:date]
  raise "Bad date format" unless date =~ /\A\d\d\d\d-\d\d-\d\d\z/
  Dir["ChatHistory/#{date}/**/*"].each do |f|
    ...
  end
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