db/migrate/20090320154407_upgrade_friendly_id_to_20.rb
class UpgradeFriendlyIdTo20 < ActiveRecord::Migration
def self.up
remove_column :slugs, :updated_at
remove_index :slugs, :column => [:name, :sluggable_type]
add_column :slugs, :sequence, :integer, :null => false, :default => 1
add_index :slugs, [:name, :sluggable_type, :sequence], :name => "index_slugs_on_n_s_and_s"
end
def self.down
remove_index :slugs, :name => "index_slugs_on_n_s_and_s"
remove_column :slugs, :sequence
add_column :slugs, :updated_at, :datetime
add_index :slugs, [:name, :sluggable_type], :unique => true
end
end