rails errors 自定义

    module ApplicationHelper 
      def error_messages_for(*params) 
        options = params.last.is_a?(Hash) ? params.pop.symbolize_keys : {} 
        objects = params.collect {|object_name| instance_variable_get("@#{object_name}") }.compact 
        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 
          header_message = ""#"#{pluralize(count, 'error')} prohibited this #{(options[:object_name] || params.first).to_s.gsub('_', ' ')} from being saved" 
          #error_messages = objects.map {|object| object.errors.full_messages.map {|msg| content_tag(:li, msg) } } 
          error_messages = objects.map do |object| 
            full_messages = [] 
            object.errors.each do |attr,msg| 
              full_messages << msg unless msg.nil? || msg.blank? 
            end 
            full_messages.map{|msg| content_tag(:li,msg)} 
          end 
          content_tag(:div, 
            content_tag(options[:header_tag] || :h2, header_message) << 
              content_tag(:p, '发生以下错误:') << 
              content_tag(:ul, error_messages), 
            html 
          ) 
        else 
          '' 
        end 
      end 
    end