ruby-on-rails – STI,MTI或CTI,这是目前建议的Rails 4解决方案

STI – 单表继承是您正在寻找的.
http://api.rubyonrails.org/classes/ActiveRecord/Base.html#class-ActiveRecord::Base-label-Single+table+inheritance
http://api.rubyonrails.org/classes/ActiveRecord/Inheritance.html

您可以像往常一样创建模型,但是将属性even_type作为字符串添加到数据库中. (默认为“类型”)
你让EventModel知道,这将是继承列.

class Event < ActiveRecord::Base
    self.inheritance_column = :event_type 
    # dont forget your scopes to easy access them by type
    # Event.party or Event.ultrafestival
    scope :party,-> { where(event_type: 'Party') }
    scope :ultrafestival,-> { where(event_type: 'UltraFestival') }
    scope :tomorrowland,-> { where(event_type: 'TomorrowLand') }


    def host
      raise "needs to be implemented in your sub-class!"
    end

end

比你创建一些子类.确保它们继承自Event

class Party < Event
end

class UltraFestival < Event
end

class Tomorrowland < Event
end

基本上,所有对象都是事件！所以如果你去Event.all,你会得到它们！从技术上讲,对象可以是其他东西.所有这些“事件”将存储在同一个表中,它们将与event_type不同,event_type将在此示例中为“party”,“ultra_festival”或“tomorrowland”.

现在,您可以为每个类添加一些特殊内容

class Party < Event
     def host
       "private homeparty PTY"
     end

     def publish_photostream 
     end

     def call_a_cleaning_woman
     end
 end

class UltraFestival < Event
   attr_accessor :location

   def host
     "UMF Festival Corp."
   end

   def is_in_europe?        
   end     

   def is_in_asia?        
   end     
end

class Tomorrowland < Event

    def host
      "ID&T"
    end

    def download_after_movie!
    end

end

这是标准的Rails方式 – 多年以来.当然它在每个主持人和postgres上工作.

//编辑：如果您的子事件需要数据库中的某些特殊表,那么您需要进行MTI,多表继承.