的Rails 3 =>：的has_many XS，通过=> Y，Z

Question

我试图做类似

class Event < ActiveRecord::Base 

    has_many :links, :dependent => :destroy 
    belongs_to :activity 
    belongs_to :facility 
    has_many :infos, :through => :activity 
    has_many :infos, :through => :facility 

    accepts_nested_attributes_for :infos 

end 

但是这会导致has_many :infos, :through => :facility，而has_many :infos, :through => :activity被忽略。

我该如何用正确的语法来表达它？

编辑：

如果我实施弗拉德的方法，然后使用

@events = Event.all（：包括=> [：facility_infos，：activity_infos]：条件=> [“的相关信息.language_id =？“，2]，：order =>：time）

我得到:activity_infos for language_id == 2，但不幸的是我得到了所有语言的:facility_infos！ 如何解决这个问题？

编辑2：

这里是你要求的输出：。

选择 “事件”， “ID” AS t0_r0， “事件”， “时间” 作为t0_r1， “事件”“天天“AS t0_r2，”events“。”activity_id“AS t0_r3，”events“。”created_at“AS t0_r4，”events“。”updated_at“AS t0_r5，”events“。”facility_id“AS t0_r6，”events“。”home “AS t0_r7，”infos“。”id“AS t1_r0，”infos“。”title“AS t1_r1，”infos“。”description“AS t1_r2，”infos“。”location“AS t1_r3，”infos“。”language_id “AS t1_r4，”infos“，”created_at“AS t1_r5，”infos“。”updated_at“AS t1_r6，”infos“。”activity_id“AS t1_r7，”infos“。”facility_id“AS t1_r8，”infos“。”service_id “ 一个S t1_r9，“activity_infos_events”，“id”，AS t2_r0，“activity_infos_events”。“title”AS t2_r1，“activity_infos_events”。“description”AS t2_r2，“activity_infos_events”。“location”AS t2_r3，“activity_infos_events”。“language_id” AS t2_r4，“activity_infos_events”，“created_at”AS t2_r5，“activity_infos_events”，“updated_at”，AS t2_r6，“activity_infos_events”，“activity_id”AS t2_r7，“activity_infos_events”。“facility_id”AS t2_r8，“activity_infos_events”。“service_id” AS t2_r9 FROM“events”LEFT OUTER JOIN“facilities”ON“events”。“facility_id”=“facilities”。“id”LEFT OUTER JOIN“infos”ON“infos”。“facility_id”=“facilities”。“id” LEFT OUTER JOIN“activities”ON“events”。“activity_id”=“activities”。“id”LEFT OUTER JOIN“infos”“activity_infos_events”ON“activity_infos_events”。“activity_id”=“activities”。“id”WHERE（infos .language_id = 2）ORDER BY time

Answer 1

好吧，你可以做成fol低点：

has_many :activity_infos, :through => :activity, :source => :infos, :class_name => "Info" 
has_many :facility_infos, :thorough => :facility, :source => :infos, :class_name => "Info" 


def infos 
    activity_infos + facility_infos 
end 

UPDATE：

请出示以下的输出：

Event.includes([:facility_infos, :activity_infos]).where(['infos.language_id = ?', 2]).to_sql 

更新2：

看起来像

Event.includes([:facility_infos, :activity_infos]).where(['infos.language_id = ? AND activity_infos_events.language_id = ?', 2, 2]) 

应该回到你的期望？