models.rb

class Node < ActiveRecord::Base
  validates :name, :presence => true
end

class Team < Node
  delegate :name, :to => :profile

  after_initialize do |team|
    team.build_profile(:name => team[:name]) if team.new_record? && team.profile.nil?
  end
end

class Team::Profile < ActiveRecord::Base
  
  belongs_to :team
  
  attr_accessible :name
  validates :name, :presence => true, :on => :update
  
end