Chris@909: class AddMissingIndexesToComments < ActiveRecord::Migration
Chris@909:   def self.up
Chris@909:     add_index :comments, [:commented_id, :commented_type]
Chris@909:     add_index :comments, :author_id
Chris@909:   end
Chris@909: 
Chris@909:   def self.down
Chris@909:     remove_index :comments, :column => [:commented_id, :commented_type]
Chris@909:     remove_index :comments, :author_id
Chris@909:   end
Chris@909: end