Rails - Jun 2007 - validates_presence_of of polymophic fields

My models looks like:

class Relationship < ActiveRecord::Base
  belongs_to :link_type
  belongs_to :parent, :polymorphic => true
  belongs_to :child,  :polymorphic => true

  validates_presence_of :link_type_id
  # validates_presence_of :parent_id
  # validates_presence_of :parent_type
  # validates_presence_of :child_id
  # validates_presence_of :child_type
end

class Person < ActiveRecord::Base
  has_many :parents, :as => :parent, :class_name =>
"Relationship"
  has_many :children, :as => :child, :class_name =>
"Relationship"
end

class Company < ActiveRecord::Base
  has_many :parents, :as => :parent, :class_name =>
"Relationship"
  has_many :children, :as => :child, :class_name =>
"Relationship"
end

The four validates_presence_of lines that are commented out fail when I
do a save.  I''m doing this in my controller:

      relationship = Relationship.new(:link_type => link_type)
      @person.children << relationship
      relationship.parent = company

When I do the save, the fields are set properly in the database.  Is
this a bug or am I not doing something right?

Thank you for your help

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