STI and polymorphs

Question

I have problem with my code

class Post < ActiveRecord::Base
end

class NewsArticle < Post
  has_many :comments, :as => :commentable, :dependent =>         


        

Answer 1

Take a look at the Polymorphic Associations section of ActiveRecord::Associations API. There is a little bit about using polymorphic associations in combination with single table inheritance. Following the second code example in that section I think this might be close to what you want

class Comment < ActiveRecord::Base
  belongs_to :commentable, :polymorphic => true, :counter_cache => true

  def commentable_type=(sType)
   super(sType.to_s.classify.constantize.base_class.to_s)
  end
end

class Post < ActiveRecord::Base
  has_many :comments, :as => :commentable, :dependent => :destroy, :order => 'created_at'
end

class NewsArticle < Post
end