From: Robert Klemme <shortcutter@...>
Date: 2011-04-21T16:23:18+09:00
Subject: Re: using hash keys as object name

On Wed, Apr 20, 2011 at 11:19 PM, neubyr <neubyr@gmail.com> wrote:
> Thanks for the help Robert. Following is a scenario I am trying to implement:
> I want to create File objects based on a hash. The 'fruits' hash will
> be created based on user input (yaml file), so I don't know how long
> the hash will be beforehand. For each key in this hash I would like to
> instantiate a File object with object/var name same as hash key. In
> future I may have a subclass of File class say UserFile class. The
> UserFile objects will be instantiated in a similar manner as File
> object, in addition they will get hash values passed on as variables.

There is no need to create local variables for these File objects - in
fact, it won't work.  You rather want to create a second Hash.

FileData = Struct.new :io, :attributes

user_input = { ... } # from YAML

files = {}

user_input.each do |k,v|
  files[k] = FileData.new File.open(k), v # whatever else
end

# use files
...

# close files
files.each do |k,v|
  v.io.close
end

Note, I deliberately left out error handling in order to keep the code simple.

Kind regards

robert

-- 
remember.guy do |as, often| as.you_can - without end
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