From: Martin DeMello <martindemello@...>
Date: 2009-02-16T21:20:47+09:00
Subject: Re: How to do this complicated logic in ruby

On Mon, Feb 16, 2009 at 5:37 PM, Robert Klemme
<shortcutter@googlemail.com> wrote:
> EntryKey = Struct.new :server, :hosp, :loc do
>  def self.create(entry)
>    new(*members.map {|m| entry[m]})
>  end
> end
>
> index = Hash.new {|h,k| h[k] = []}
> # loop reading input
>  entry = ...
>  index[EntryKey.create(entry)] << entry
>
> # now you can process them or do it while reading
>
> See also Martin's reply which goes into the same direction just with a
> different approach.

The different approach is mostly due to the fact that I'm
uncomfortable using objects with mutable fieds as hash keys. I prefer
to explicitly map them to a string, and then use that string as a hash
key.

martin