You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: 20120906011421_update_to_authlogic.rb
    path of file: ./repos/alonetone/db/migrate
    
    the code of the file until where you have to start completion: class UpdateToAuthlogic < ActiveRecord::Migration
  def up
    change_column :users, :crypted_password, :string, :limit => 128,
      :null => false, :default => ""
    change_column :users, :salt, :string, :limit => 128,
      :null => false, :default => ""
    add
    
  def up
    change_column :users, :crypted_password, :string, :limit => 128,
      :null => false, :default => ""
    change_column :users, :salt, :string, :limit => 128,
      :null => false, :default => ""
    add_column :users, "remember_token",         :string
    add_column :users, "remember_created_at",    :string
    add_column :users, "login_count",            :integer,  :null => false, :default => 0
    add_column :users, "current_login_at",       :datetime
    add_column :users, "current_login_ip",       :string
    add_column :users, :persistence_token,       :string          
    rename_column :users, :ip, :last_login_ip
  end