ruby-on-rails – 自定义验证器不在Ruby on Rails中加载

class Issue < ActiveRecord::Base
  attr_accessible :description,:no_followers,:title
  validates_presence_of :title
  validates_uniqueness_of :title,message: "Title should be unique!"

  validates_length_of :description,minimum: 10,maximum: 50
  validates_numericality_of :no_followers,allow_blank: true

  validates_with YesNoValidator

end

验证器是位于app / validators的文件,包含以下内容：

class YesNoValidator < ActiveModel::Validator
    def validate record
        if record.title.include? "yes" && record.description.include? "No"
            record.errors[:title] << "Title has the word yes and description has the word no"
        end 
    end
end

我也尝试将它放在lib文件夹中,但也会出现此错误：

Routing Error

uninitialized constant Issue::YesNoValidator

随机F5’我有时会得到这个错误：

NoMethodError in IssuesController#new

undefined method `key?' for nil:NilClass

因此,似乎没有加载类的文件,所以我尝试将lib以及app / validators文件夹添加到application.rb中的autoload_paths.但这也不起作用..

有谁之前经历过这个吗？