vendor/rails/activerecord/test/migrations/duplicate/1_people_have_last_names.rb

   1 class PeopleHaveLastNames < ActiveRecord::Migration
   2   def self.up
   3     add_column "people", "last_name", :string
   4   end
   5
   6   def self.down
   7     remove_column "people", "last_name"
   8   end
   9 end