辅助模块导致 friday_night_issue ... RoR答案

【问题标题】：Helper Module causing friday_night_issue ... RoR辅助模块导致 friday_night_issue ... RoR
【发布时间】：2016-06-01 14:23:55
【问题描述】：

ENV=发展

任何人都想知道为什么

     def tidy_address(location)
       t_address=t_address+"<br>"+location.address1 if location.address1.present?
       t_address=t_address+"<br>"+location.address2 if location.address2.present?
       t_address=t_address+"<br>"+location.address3 if location.address3.present?
       t_address=t_address+"<br>"+location.postcode if location.postcode.present?
     end

正在抛出错误

 undefined method `+' for nil:NilClass

我似乎正在将一个方法应用于一个字符串，但我不确定如何解决这个问题

也试过了

     ... +"<br>#{location.field}" ...

接受酒后建议

【问题讨论】：

标签： ruby-on-rails concat

【解决方案1】：

呜呜……

所以这解决了它 - 我是一个旧的 ASP hack，它很懒

 def tidy_address(location)
   t_address="<br>"+location.address1 if location.address1.present?
   t_address=t_address+"<br>"+location.address2 if location.address2.present?
   t_address=t_address+"<br>"+location.address3 if location.address3.present?
   t_address=t_address+"<br>"+location.postcode if location.postcode.present?
 end

【讨论】：