acts_as_list and single table inheritence

Hello Rails experts,

Need your help in following issue with the <b>acts_as_list and single table inheritence</b>

Code details : #model file class <b>RelatedItem</b> < ActiveRecord::Base acts_as_list :scope => :relater belongs_to :relater, :polymorphic=>true end

class RelatedLink < <b>RelatedItem</b>

end

class RelatedFeed < <b>RelatedItem</b>

end

class Clip < ActiveRecord::Base has_many :<b>related_items</b>, :as => :relater end

## Table Structure of <b>RelatedItem</b> id :integer(11) name :string(255) relater_id :integer(10) relater_type :string(255) type :string(255) position :integer(10) source :string(255)