Rais has_many＆通過查詢

我使用Rails 2.3，我有3個表，它管理用戶對建築物的權限。 mygroups表是用戶和建築物所屬的組的列表。 mygroupsbuildings是與其關聯組的建築物列表。 mygroupsusers是具有關聯組的用戶列表。Rais has_many＆通過查詢

create_table "mygroups", :force => true do |t| 
    t.string "name" 
    t.integer "user_id" 
    t.string "user_name" 
    t.integer "permissions" 
end 

create_table "mygroupbuildings", :force => true do |t| 
    t.integer "mygroup_id" 
    t.integer "building_id" 
end 

create_table "mygroupusers", :force => true do |t| 
    t.integer "mygroup_id" 
    t.integer "user_id" 
    t.string "user_name" 
end

我想創建發現如果特定user_id是作爲特定building_id同一組的成員的查詢。

我已經安裝了以下關聯：

class Mygroup < ActiveRecord::Base 
    has_many :mygroupusers 
    has_many :mygroupbuildings 
end 

class Mygroubuilding < ActiveRecord::Base 
    belongs_to :mygroup 
    has_many :mygroupusers, :through => :mygroup 
end 

class Mygroupuser < ActiveRecord::Base 
    belongs_to :mygroup 
    has_many :mygroupbuildings, :through => :mygroup 
end

我寫了下面的查詢：

Mygroupuser.find(:all, 
       :include => :mygroupbuildings, 
       :select => "mygroupbuildings.building_id, mygroupusers.user_id", 
       :conditions => ["mygroupbuildings.building_id = '#{building.id}' AND mygroupusers.user_id = '#{current_user.user_id}'"])

這給我下面的錯誤：

的ActiveRecord :: StatementInvalid（mysql的::錯誤：'on子句'中的未知列'mygroups.mygroup_id'：SELECT mygroupusers。id AS t0_r0，mygroupusers。mygroup_id AS t0_r1，mygroupusers。 user_id AS t0_r2，mygroupusers。 user_name AS t0_r3，mygroupusers。 created_at AS t0_r4，mygroupusers。 updated_at AS t0_r5，mygroupbuildings。 id AS t1_r0，mygroupbuildings。 mygroup_id AS t1_r1，mygroupbuildings。 coursewalk_id AS t1_r2，mygroupbuildings。 created_at AS t1_r3，mygroupbuildings。 updated_at AS t1_r4 FROM mygroupusers LEFT OUTER JOIN mygroups ON（mygroupusers。id = mygroups。mygroup_id）LEFT OUTER JOIN mygroupbuildings ON（mygroupbuildings。mygroup_id = mygroups。id）WHERE（mygroupbuildings.building_id = '2' 和mygroupusers.user_id = '55' ））：

感謝，

尼克，

來源

2012-10-01 user2666194

這是查詢需要如何設置，返回包含查詢USER_ID和building_id組：

Mygroup.find(:all, 
      :include => [:mygroupbuildings, :mygroupusers], 
      :conditions => ["mygroupbuildings.building_id = #{building.id} AND mygroupusers.user_id = #{current_user.user_id}"])

來源

2012-10-01 23:20:44 user2666194

Rais has_many＆通過查詢

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