From: "Wayne E. Seguin" <wayneeseguin@...>
Date: 2007-08-21T23:42:43+09:00
Subject: Re: get a class from its name

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On Aug 20, 2007, at 20:16 , Rolando Abarca wrote:
> This is how i'm currently getting a class object from a name:
>
>         cname = "A::B::C::D"
>         klass = cname.split("::").inject(Kernel) {|a,b| a.const_get 
> (b)}
>
> I think it's pretty elegant, but I'm always happy to hear other  
> ways to do it ;-)
> Anyone does this in some other way? (I don't want to eval code...)

I use pretty much  the same thing:

class String
   def const_get
     self.split( "::" ).inject( Kernel ) { | parent, child |  
parent.const_get( child ) }
   end
end

# Example

module A
   class B
     C = 'c'
   end
end

 >> "A".const_get
=> A

 >> "A::B".const_get
=> A::B

 >> "A::B::C".const_get
=> "c"

   ~Wayne

s///g
Wayne E. Seguin
Sr. Systems Architect & Systems Administrator


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