1_create_posts.rb

class CreatePosts < ActiveRecord::Migration
  def self.up
    create_table :posts do |t|
      t.timestamps
    end
    Post.create_translation_table! :title => :string, :text => :text
  end

  def self.down
    drop_table :posts
    Post.drop_translation_table!
  end
end

gistfile3.txt

post.rb

class Post < ActiveRecord::Base
  internationalize :title, :text
end

rails console

irb(main):001:0> P = Post.new
=> #<Post id: nil, created_at: nil, updated_at: nil>
irb(main):002:0> p.title
NoMethodError: undefined method `title' for nil:NilClass
	from /Library/Ruby/Gems/1.8/gems/activesupport-3.0.0.beta/lib/active_support/whiny_nil.rb:49:in `method_missing'
	from (irb):2
irb(main):003:0> p.title = "test"
NoMethodError: undefined method `title=' for nil:NilClass
	from /Library/Ruby/Gems/1.8/gems/activesupport-3.0.0.beta/lib/active_support/whiny_nil.rb:49:in `method_missing'
	from (irb):3
irb(main):004:0> p.translated_attributes
=> {:text=>nil, :title=>nil}
irb(main):005:0> p.translations
=> []