ruby-on-rails - Rails 3 条件验证（信用卡）：语法错误

Question

看起来很奇怪，对吗？

validates_presence_of [:visa, :mc, :discover, :amex], :if => :credit_card => true

任何输入表示赞赏，在浏览器中出现语法错误。谢谢。

Answer 1

试试这个

validates :visa, :mc, :discover, :amex, :presence => true, :if => :credit_card?

如果信用卡是一个布尔字段。

否则定义一个方法

def credit_card?
    credit_card.present?
end

Answer 2

你也可以用proc来做

validates :visa, :mc, :discover, :amex, :presence => true, :if => Proc.new{|model| model.credit_card.present?}

Answer 3

明白了，虽然很痛苦。而且无论如何都不完美。下一步将是用户只能选择信用卡或支票。jQuery？

模型.rb

validate :check_if_at_least_one_credit_card, :if => "credit_card=='1'"
validate :check_if_check_is_clicked, :if => "check=='1'"

private

  def check_if_at_least_one_credit_card
    unless mc=="1" || visa=="1" || amex=="1" || discover=="1"
      errors.add(:base, "You need to choose at least one credit card type")
    end
  end

  def check_if_check_is_clicked
    unless check=="1"
      errors.add(:base, "You need to choose check or credit card")
    end
  end

然后这需要一些清理但按预期工作。

模板.html.haml

%p{ :style => "font-size: 13px; color: #848687;" }= @bulk_order.check=="1" ? 'Check' : ''
%p{ :style => "font-size: 13px; color: #848687;" }= @bulk_order.credit_card=="1" ? 'Credit Card' : ''
%ul
  %li{ :style => "font-size: 13px; color: #848687;" }= @bulk_order.discover=="1" ? 'Discover' : ''
  %li{ :style => "font-size: 13px; color: #848687;" }= @bulk_order.amex=="1" ? 'American Express' : ''
  %li{ :style => "font-size: 13px; color: #848687;" }= @bulk_order.mc=="1" ? 'Mastercard' : ''
  %li{ :style => "font-size: 13px; color: #848687;" }= @bulk_order.visa=="1" ? 'Visa' : ''