[英]Self-referencing has_many, :through
這是我的用戶 model:
class User < ActiveRecord::Base
has_many :friends, :class_name => 'Friendship', :dependent => :destroy
end
這是我的友誼model:
class Friendship < ActiveRecord::Base
belongs_to :user
belongs_to :friend, :class_name => 'User', :foreign_key => 'friend_id'
set_table_name :users_users
end
現在,我在名為 *is_awesome* 的用戶 model 中有一個 boolean 屬性。
當我嘗試運行此查詢時:
User.find(1).friends.find(:all, :include => :users, :conditions => {:is_awesome => false})
我收到以下錯誤:
ActiveRecord::StatementInvalid: Mysql::Error:
Unknown column 'users_users.is_awesome' in 'where clause':
SELECT * FROM `users_users`
WHERE (`users_users`.user_id = 1 AND (`users_users`.`is_awesome` = 0))
知道發生了什么嗎?
您必須更改:條件以引用用戶表,它應該看起來像這樣:
User.find(1).friends.find(:all, :include => :users, :conditions => "users.is_awesome IS FALSE")
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