https://ruby-china.org/eastfox2002 en-us <p>我现在有 seat 和 flight 两个 model 定义了 flight has_many seats seat belongs_to flight 我想验证 seat 中的 baggage 小于 flight 中的 baggage_allowance，网上找了半天，怎么试都失败 我写的代码 validates :baggage, :numericality =&gt;{:less_than =&gt; flight.baggage_allowance } 把 flight.baggage_allowance 换成数字就能执行，现在这样不行 求指教，谢谢</p> eastfox2002 Thu, 18 Jul 2013 16:02:41 +0800 https://ruby-china.org/topics/12590 https://ruby-china.org/topics/12590