为什么我得到“未知验证器:'MessageValidator'"? [英] Why do I get "Unknown validator: 'MessageValidator'"?

问题描述

我收到此错误

未知验证器:'MessageValidator'

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?

I have no idea why I'm getting that.
What's wrong with my code?

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

推荐答案

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"}

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