ruby-on-rails - 为什么我得到 "Unknown validator: ' MessageValidator'"？

Question

我收到这个错误

Unknown validator: 'MessageValidator'

我不知道为什么我会得到那个。
我的代码有什么问题？

validates :title,   
    :presence => true,   
    :uniqueness => true,   
    :length => { :maximum => 100 },
    :message => "Must be input and has to be less than 100 characters, and unique."

Answer 1

尝试:

validates :title, 
          :presence => {:message => "Title can't be blank." },
          :uniqueness => {:message => "Title already exists."},
          :length => { :maximum => 100, :message => "Must be less than 100 characters"}