gistfile1.rb

class Fixtables < ActiveRecord::Migration
  def self.up
   change_column :table_name, :column_name, :newtype
   change_column :table_name, :column_name2, :newtype
   change_column :table_name2, :column_name, :newtype
  end
  def self.down
   change_column :table_name, :column_name, :oldtype
   change_column :table_name, :column_name2, :oldtype
   change_column :table_name2, :column_name, :oldtype
  end
end