Rails 3.1中是否已取消"def验证"？

Question

Rails 3.1中是否已取消"def验证"？我在Rails 3.1之前,它似乎没有工作

class Category < ActiveRecord::Base
  validates_presence_of :title

  private 

  def validate
    errors.add(:description, "is too short") if (description.size < 200)
  end 
end

"标题"验证有效,但"描述"验证不起作用.

Answer 1

这样的事情对你有用吗？

class Category < ActiveRecord::Base
  validates_presence_of :title
  validate :description_length

  def description_length
    errors.add(:description, "is too short") if (description.size < 200)
  end 
end