Adding Firstname, middle name and last names to a Ruby on Rails app

I was wanting to add first name, middle name and last name columns to a Ruby on Rails application (specifically the Rails-Devise tutorial from RailsApps).

After a couple of hours working through various sites I came up with three migrations:

timestamp_add_first_last_to_users.rb
class AddFirstLastToUsers < ActiveRecord::Migration
  
  def self.up
    change_table :users do |t|
      add_column :users, :first_name, :string
      add_column :users, :middle_name, :string
      add_column :users, :last_name, :string
    end
  end
  
  def self.down
    remove_column :users, :first_name
    remove_column :users, :middle_name
    remove_column :users, :last_name    
  end    
end

timestamp_update_names_to_users
class UpdateNamesToUsers < ActiveRecord::Migration
  def up
    User.all.each do |user|
      na=user.name.split(" ")
      nc=na.size
      user.first_name=na[0]
      user.last_name=na.last if na.size>1
      user.middle_name= na[1..na.size-1].join(" ") if na.size>2
      user.save!
    end
  end
  
  def down
    User.all.each do |user|
      user.name = [user.first_name, user.middle_name, user.last_name].compact.join(" ")
      user.save!
    end
  end
end

timestamp_remove_name_from_users.rb
class RemoveNameFromUsers < ActiveRecord::Migration
  def up
    remove_column :users, :name, :string
  end

  def down
    add_column :users, :name, :string
  end
end

This works, but is probably not the best solution.

If you have an easier way, please feel free to let me know.