尝试使用Ruby Activescaffold返回各种模型，在具有继承的模型上查找

有可能做到以上几点吗

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谢谢大家!

回答如上所述。

在我的测试中，这很有效，我会得到

折扣促销

或

凭证促销

，具体取决于

类型

字段中的内容。也许你可以给出一个更完整的例子来说明哪里出了问题，包括你的模式和子类是什么样子的？你是对的，它很有效！抱歉，这只是一个错误-我没有正确测试它。。。

class Promotion 
 def self.get_todays_promotions
    # Promotion is a parent model, having child models e.g.
    # DiscountPromotion, VoucherPromotion, etc.
    # they all use a single table called promotions 
    # (and having 'type' field explaining which model they belong to)
    promotions = self.find(:all, :conditions => [Promotion.date_check_query], :order => "#{Promotion.table_name}.order_of_calculation")

    # Normally promotions would contain a collection of Promotion models. 
    # I want to return a collection of various models here depending on
    # each model's class name
  end
end