Question

到目前为止，我了解到您只能在控制器中引发错误消息。 Sale模型是Order模型的子项。所以我这样做了：

class SalesController < ApplicationController
 def create
  ...
  if @sale.errors.any?
   flash[:error] = "#{@order.sale.errors.full_messages.to_sentence}"
  end
 end

class Sale < ActiveRecord::Base
before_save :discount

def discount=(discount)
 if discount.present?
  if current_user.maxdiscount >= discount.to_d
    discount = discount.gsub(",", ".")
    self[:discount] = discount
  else
    self.errors.add(:discount, "The discount is too high. The product was added without it.")
  end
 end
end

但这不起作用。主要目标是在用户尝试提交大于current_user.maxdiscount的值时引发错误消息。

任何想法？提前谢谢！

Answer 1

是的，您可以在模型级别记录错误消息。

但是当你在回调中这样做时，你必须通过返回false或手动引发错误来停止交易。

class Sale < ActiveRecord::Base
   before_save :discount

   def discount=(discount)
     if discount.present?
      if current_user.maxdiscount >= discount.to_d
        discount = discount.gsub(",", ".")
        self[:discount] = discount
      else
        self.errors.add(:discount, "The discount is too high. The product was added without it.")
        return false
      end
   end
end

Rails：通过模型向控制器添加错误消息

1 个答案: