Add magic encoding comment to generated files

Scenario: Comment is a polymorphic model. So products, blogs, games all has_many :comments.

If I want to add a counter_cache option, I gotta add a comments_count row to each one of the different things that a comment can belong to. In my app, that's 10 or so different models.

It might be useful to store the counter_cache information in memcached.

Perhaps the syntax:

class Comment
  belongs_to :comment_of, :polymorphic => true, :counter_cache => true, :storage => :memcached

  # or, storage option could default to db
  belongs_to :comment_of, :polymorphic => true, :counter_cache => true, :storage => :db 
end