error_messages_for错误信息排序

首先在application_helper.rb文件下加入下面两个方法

#error_messages_for方法修改
  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
    error_messages = objects.map do |object| 
      sort_show_error_msg(object)
    end
    count  = objects.inject(0) {|sum, object| sum + error_messages[0].size}
    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
      error_message = "個の入力の不備が"
      header_message = "#{count} #{error_message} あります。"
      # Change 'error' to 'errors' for english setups void of a localization plugin
      header_message.gsub!("error", "errors") if header_message.include?(error_message) and count > 1
      content_tag(:div,
                  content_tag(options[:header_tag] || :h2, header_message) <<
      content_tag(:p, 'There were problems with the following fields:') <<
      content_tag(:ul, error_messages),
      html
      )
    else
        ''
    end
  end

  def sort_show_error_msg(obj)
#    config = active_scaffold_config
    msg_arr = obj.errors.sort 
    #去除隐藏字段
    hidden_attr = obj.class::HIDDEN_ATTRIBUTES rescue []
    msg_arr.delete_if{|key,val|hidden_attr.include?(key)} unless hidden_attr.blank?
    #排序
    hash_field_orders = obj.class::HUMANIZED_ATTRIBUTES_ORDERS rescue []
    unless hash_field_orders.blank?
      msg_arr = msg_arr.sort do |key_a,key_b|
        hash_field_orders[key_a[0].to_sym]
        hash_field_orders[key_a[0].to_sym] <=> hash_field_orders[key_b[0].to_sym]
      end
    end
    full_messages = []
      msg_arr.each do|attr,msg|
         next if msg.nil?
         if attr == "base"
           full_messages << msg
         else
           label = obj.class.human_attribute_name(attr)
           full_messages << content_tag(:li,"#{label + " " + msg}")
         end
      end
    return full_messages
  end

然后在你想要排序model里加入

HUMANIZED_ATTRIBUTES_ORDERS = 
  {
    :login=> 1,
    :name => 2,
    :email => 3,
    :password => 4,
    :password_confirmation => 5
  }

后面的数字就是错误信息的位置
然后view中写:

<%= error_messages_for :user %>