From: Tim Pease <tim.pease@...>
Date: 2007-02-15T05:44:54+09:00
Subject: Re: how to do: var1 = var2.new(.....) (var2 contains classname)

On 2/14/07, Luca Scaljery <lcalje@gmail.com> wrote:
> Hi All
>
> I have a situation in which I have the name of the class in a variable
> So normally I would do
>     song = Song.new("Bicylops", "Fleck", 260)
>
> But I need to do something like
>     var2 = "Song"
>     var1 = var2.new("Bicylops", "Fleck", 260)
>
> This doesn't work!
> Any suggestions how to do this ?
>

You need to convert your string "Song" into a Class object.

var2 = "Song"
var1 = Object.const_get(var2).new("Bicyclops", "Fleck", 260)

All class and module objects are stored as constants in Object.  It
gets a little tricky if you have a class withing a module --
"Music::Song".  Then you'll have to do something like this:

current = Object
var2 = "Music::Song"
var2.split("::").each do |str|
  current = current.const_get(str)
end
var1 = current.new( ... )


Hope this helps

TwP