Problem with :name of child

app_concerns_AssetChild.rb

module AssetChild
    
  # by defining a module this should allow us to make nice code which adds:
  #
  # -   has_one :assets
  # -   adds an after_create hook which automaticly builds the asset.
  # -   at some latter point we can also add after_update - to update the asset it's timestamp. 
  # -   give access to asset attributes such as name => @usecase.name instead of @usecase.asset.name
  #
  #   -> http://weblog.jamisbuck.org/2007/1/17/concerns-in-activerecord

  def self.included(base)
    base.has_one :asset, :as => :assetchild
    base.has_one :project, :through => :asset 
  end
  
end

app_models_Actor.rb

class Actor < ActiveRecord::Base

  # Is asset child
  include AssetChild

    accepts_nested_attributes_for :asset

end

app_models_Asset.rb

class Asset < ActiveRecord::Base
    
  belongs_to :assetchild, :polymorphic => true
  
  accepts_nested_attributes_for :assetchild
  
end