rosa-build/db/migrate/20111021164945_delete_nickname_init_uname.rb

class DeleteNicknameInitUname < ActiveRecord::Migration
  def self.up
    remove_column :users, :nickname
    add_index :users, :uname, :unique => true
    User.all.each {|u| User.where(:id => u.id).update_all(:uname => u.email.split('@').first.gsub(/[^a-zA-Z0-9_]/, '_'))}
  end

  def self.down
    add_column :users, :nickname, :string
    remove_index :users, :uname
    User.all.each {|u| User.where(:id => u.id).update_all(:nickname => u.email.split('@').first.gsub(/[^a-zA-Z0-9_]/, '_'))}
  end
end