I forgot about the problems with STI
you would have to define commentable_type method in BaseContent as
said in the: activerecord/lib/active_record/associations.rb
# Using polymorphic associations in combination with single table
inheritance (STI) is a little tricky. In order
# for the associations to work as expected, ensure that you store
the base model for the STI models in the
# type column of the polymorphic association. To continue with the
asset example above, suppose there are guest posts
# and member posts that use the posts table for STI. In this case,
there must be a +type+ column in the posts table.
#
# class Asset < ActiveRecord::Base
# belongs_to :attachable, :polymorphic => true
#
# def attachable_type=(sType)
# super(sType.to_s.classify.constantize.base_class.to_s)
# end
# end
#
# class Post < ActiveRecord::Base
# # because we store "Post" in attachable_type now :dependent
=> :destroy will work
# has_many :assets, :as => :attachable, :dependent => :destroy
# end
#
# class GuestPost < Post
# end
#
# class MemberPost < Post
# end
#
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