From: "Simon Kröger" <SimonKroeger@...>
Date: 2006-06-23T04:09:01+09:00
Subject: Re: Turning an Array into a Hash based on an attribute value

Ashley Moran wrote:
> A guy I work with has some some work on an ActiveRecord class that
> basically reads static lookup data, and contains (among other things) an
> "identifier" attribute.  Given an array of all these objects he wanted
> to access them by the contents of the identifier attribute, eg:
> 
>   > [1, "2", :three].hash_on(:class)
>   => {:String=>"2", :Symbol=>:three, :Fixnum=>1}
> 
> Is there a neater (one-line?) way I missed?
> 
> Ashley

class Array
  def hash_on(method)
    inject({}){|h, i| h.merge({i.send(method).to_s.to_sym, i})}
  end
end

cheers

Simon