class TranslationKey < ActiveRecord::Base
  has_many :translations, :class_name => 'TranslationText', :dependent => :destroy

  accepts_nested_attributes_for :translations, :allow_destroy => true

  validates_uniqueness_of :key
  validates_presence_of :key

  attr_accessible :key, :translations, :translations_attributes

  def self.translation(key, locale)
    return unless translation_key = find_by_key(key)
    return unless translation_text = translation_key.translations.find_by_locale(locale)
    translation_text.text
  end

  def self.available_locales
    @@available_locales ||= TranslationText.count(:group=>:locale).keys.sort
  end
end