Chris@0: class AddMissingIndexesToComments < ActiveRecord::Migration
Chris@0:   def self.up
Chris@0:     add_index :comments, [:commented_id, :commented_type]
Chris@0:     add_index :comments, :author_id
Chris@0:   end
Chris@0: 
Chris@0:   def self.down
Chris@0:     remove_index :comments, :column => [:commented_id, :commented_type]
Chris@0:     remove_index :comments, :author_id
Chris@0:   end
Chris@0: end