From: Vincent Fourmond <vincent.fourmond@9online.fr>
Date: 2007-01-25T08:14:37+09:00
Subject: Re: can it be shorter?

Dorren wrote:
> doing access control on rails controller,
> 
> ------ I have this input --------------
> hash = {"index" => "list",
>           ["edit", "update"] => "manage_one",
>           ["new", "create", "destroy"] => "manage_all"}
> 
> ------- I want this output ----------
> {"index"=>"list",
>  "edit"=>"manage_one",
>  "update"=>"manage_one",
>  "new"=>"manage_all",
>  "create"=>"manage_all",
>  "destroy"=>"manage_all"
> }
> 
> ------ I have this code ------------
>   hash = Hash[*hash.to_a.collect{|x|
>                        Array === x[0] ? x[0].zip([x[1]]*x[0].size) : x
>                     }.flatten]
> 
> ----- I want shorter code ------

  What about this:

h = {}
for k,v in hash
  [k].flatten.each {|l| h[l] = v}
end
hash = h
> => {"new"=>"manage_all", "edit"=>"manage_one",
"destroy"=>"manage_all", "create"=>"manage_all", "index"=>"list",
"update"=>"manage_one"}

  Cheers,

	Vincent

-- 
Vincent Fourmond, PhD student (not for long anymore)
http://vincent.fourmond.neuf.fr/