formtastic_i18n_localized_string.rb

# lib/formtastic.rb
def localized_string(key, value, type, options = {}) #:nodoc:
  key = value if value.is_a?(::Symbol)
  if value.is_a?(::String)
    value
  else
    use_i18n = value.nil? ? @@i18n_lookups_by_default : (value != false)
    if use_i18n
      model_name, nested_model_name  = normalize_model_name(self.model_name.underscore)
      action_name = template.params[:action].to_s rescue ''
      attribute_name = key.to_s
      defaults = ::Formtastic::I18n::SCOPES.collect do |i18n_scope|
        i18n_path = i18n_scope.dup
        i18n_path.gsub!('{{action}}', action_name)
        i18n_path.gsub!('{{model}}', model_name)
        i18n_path.gsub!('{{nested_model}}', nested_model_name) unless nested_model_name.nil?
        i18n_path.gsub!('{{attribute}}', attribute_name)
        i18n_path.gsub!('..', '.')
        i18n_path.to_sym
      end
      defaults << ''
      i18n_value = ::Formtastic::I18n.t(defaults.shift,
        options.merge(:default => defaults, :scope => type.to_s.pluralize.to_sym))
      i18n_value.blank? ? nil : i18n_value
    end
  end
end