From: neubyr <neubyr@...>
Date: 2011-04-23T10:40:44+09:00
Subject: Re: using hash keys as object name

Thanks a lot for explaining the basics.. Changed the implementation.

--
neuby

On 4/21/11, Robert Klemme <shortcutter@googlemail.com> wrote:
> 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
> http://blog.rubybestpractices.com/
>
>