Globalize3 + RailsAdmin

page.rb

# app/models/page.rb
class Page < ActiveRecord::Base
  validates :translations, presence: :true

  translates :name, :content
  accepts_nested_attributes_for :translations, allow_destroy: true

  mount_uploader :image, ImageUploader

  def to_param
    "#{id} #{translation.name}".parameterize
  end
end

rails_admin.rb

# config/initializers/rails_admin.rb
# RailsAdmin config file. Generated on November 22, 2012 00:33
# See github.com/sferik/rails_admin for more informations

RailsAdmin.config do |config|
  config.model 'Page' do
    include_all_fields
    list do
      field :name
      field :image
      field :created_at do
        column_width 200
      end
    end
  end
  config.model 'Page::Translation' do
    visible false
    field :name
    field :locale, :enum do 
      enum_method do
        :locale_enum
      end
    end
    field :content, :ck_editor
  end
end

translation.rb

# app/models/page/translation.rb
class Page::Translation < Globalize::ActiveRecord::Translation 
  validates :name, length: { maximum: 255 }, presence: true
  validates :locale, presence: true, uniqueness: { scope: :page_id }

  def locale_enum
    I18n.available_locales
  end
end