Rails - Mar 2006 - Has_one and Class Table Inheritance

Hello, is there something wrong with using has_one to implement Class
Table Inheritance ?

Eg.

class Person < ActiveRecord::Base
   # attributes : eg. name, string
end

class Contact < Person
   # attributes :
   has_one :Person
   belongs_to :Company
end

Of course for a such simple case I could use Single Table Inheritance
but this is only an example and I don''t like too much the fact of
mixing
in a single table a bunch of inrelated and unused properties.

Your advice is welcome, thanks

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