Rails 2.2.2 + Validatable 1.6.7 + I18N + Error Messages

- Create /lib/errors.rb

module Validatable
  class Errors
        def validatable_full_messages(obj)
      full_messages = []

      errors.each_key do |attribute|
        errors[attribute].each do |msg|
          next if msg.nil?

          if attribute.to_s == "base"
            full_messages << msg
          else          
            full_messages << I18n.translate("activerecord.attributes.#{obj.class.name.underscore}.#{attribute}") + " " + msg
          end
        end
      end
      full_messages
    end
    end
end

- Add this function to /app/helpers/application_helper.rb

 def validatable_error_messages_for(*params)
  options = params.extract_options!.symbolize_keys

  if object = options.delete(:object)
   objects = [object].flatten
  else
   objects = params.collect {|object_name| instance_variable_get("@#{object_name}") }.compact
  end

  count  = objects.inject(0) {|sum, object| sum + object.errors.count }
  unless count.zero?
   html = {}
   [:id, :class].each do |key|
    if options.include?(key)
     value = options[key]
     html[key] = value unless value.blank?
    else
     html[key] = 'errorExplanation'
    end
   end
   options[:object_name] ||= params.first

   I18n.with_options :locale => options[:locale], :scope => [:activerecord, :errors, :template] do |locale|
    header_message = if options.include?(:header_message)
     options[:header_message]
    else
     object_name = options[:object_name].to_s.gsub('_', ' ')
     object_name = I18n.t(object_name, :default => object_name, :scope => [:activerecord, :models], :count => 1)
     locale.t :header, :count => count, :model => object_name
    end
    message = options.include?(:message) ? options[:message] : locale.t(:body)
    error_messages = objects.sum {|object| object.errors.validatable_full_messages(object).map {|msg| content_tag(:li, msg) } }.join

    contents = ''
    contents << content_tag(options[:header_tag] || :h2, header_message) unless header_message.blank?
    contents << content_tag(:p, message) unless message.blank?
    contents << content_tag(:ul, error_messages)

    content_tag(:div, contents, html)
   end
  else
   ''
  end
 end

- edit /config/environment.rb, add:

require "errors"

- in views, use:

<%= validatable_error_messages_for "inviter" %>

- for i18n file, follow the structure of ActiveRecord