在Rails中error_messages_for為國際化的考慮不是很周全，它顯示的是模型的字段名稱，這對于用戶來說是不友好的。為了解決這個問題，只能改它的源碼了----將如下方法，放入
ApplicationHelper
文/陳剛? www.chengang.com.cn? 轉(zhuǎn)載請聲明出處
? def?error_messages_for(*params)
????#add?by?glchengang
????key_hash?=?{}
????if?params.first.is_a?(Hash)
??????key_hash?=??params.first
??????params.delete_at(0)
????end
????#add?end
????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
??????#?change?by?glchengang
??????header_message?=?"有#{count}個錯誤"
#???????header_message?=?"#{pluralize(count,?'error')}?prohibited?this?#{(options[:object_name]?||?params.first).to_s.gsub('_',?'?')}?from?being?saved"
??????
??????#add?by?glchengang
??????error_messages?=?objects.map?do?|object|
????????temp?=?[]
????????object.errors.each?do?|attr,?msg|
??????????temp?<<?content_tag(:li,?(key_hash[attr]?||?attr)?+?msg)?
????????end
????????temp
??????end
??????#add?end
#????????error_messages?=?objects.map?{|object|?object.errors.full_messages.map?{|msg|?content_tag(:li,?msg)?}?}
??????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
使用依然兼容老的方式，你也可以傳入一個哈希表，把模型字段顯示成對應的中文，示例如下：
<%=?
h?=?{'username'=>'用戶名',?'password'=>'密碼'}
error_messages_for?h,?:user
%>
另外，還要在environment.rb的最后插入以下代碼：
errors?=?ActiveRecord::Errors.default_error_messages
errors[:taken]?=?'已經(jīng)被使用'
errors[:blank]?=?'不能為空'