class StiForTransactions < ActiveRecord::Migration def self.up rename_table "creditcard_txns", "transactions" add_column "transactions", "type", :string remove_column "transactions", "creditcard_id" Transaction.update_all(:type => 'CreditcardTxn') if defined? Transaction end def self.down rename_table "transactions", "creditcard_txns" remove_column "transactions", "type" add_column "transactions", "creditcard_id", :integer end end