验证 rails 中多个属性之一的存在 [英] Validate presence of one of multiple attributes in rails

问题描述

在多语言应用程序中，用户可以输入他们的中文和英文名称.用户可以输入一个或两个，但必须至少输入一个名称.

In an multilingual application, a user can input their Chinese and English names. The user can input either or both, but must input at least one name.

class Person < ActiveRecord::Base
  validates :zh_name, :presence => true
  validates :en_name, :presence => true
  validates :fr_name, :presence => true
end

由于内置的​​ :validates_presence_of 方法只能同时验证两个属性，有没有办法验证 rails 中至少一个属性的存在?

Since the built-in :validates_presence_of method can only validate both attributes at once, is there a way to validate the presence of at least one of many attributes in rails?

就像一个魔法，validates_one_of :zh_name, :en_name, :fr_name

先谢谢你，

推荐答案

validate :at_least_one_name

def at_least_one_name
  if [self.zh_name, self.en_name, self.fr_name].reject(&:blank?).size == 0
    errors[:base] << ("Please choose at least one name - any language will do.")
  end
end      

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