For tumblr post.

search.rb

class Search < ActiveRecord::Base
  belongs_to :searchable, :polymorphic => true 

  # This will actually work now, no more
  # n + 1 query problems, yay!
  default_scope :include => :searchable
  
  def hash
    searchable_id.hash + searchable_type.hash
  end
  
  def eql?(result)
    searchable_type == result.searchable_type and
      searchable_id == result.searchable_id
  end
  
  # And view results can't be updated, so...
  def readonly?
    true
  end
end