Multilevel Class inheritance

Hello there,

I am having a problem inheriting an already inherited class.

errr… sounds more complicated than it is… look:

class Item < ActiveRecord::Base

has a name and description field

end

class Reference < Item

has a something field

end

class UrlReference < Reference
#has an url field
end

… now If I do make a u = UrlReference.new in the console for
example, the u instance does NOT have the url field… only the ones
from Reference and Item…

How come? I guess that’s basic ruby… but how do I properly inherit
from other classes which again inherit from other ones? Did I miss
something here?

Cheers & thanks,
-Joerg