我没有任何想法你可以给我任何线索(如参考网站).任何帮助将不胜感激.
Model1: GROUP(id,name) Model2: USER_GROUP_CMB(id,user_id,group_id)
预期的sql语句:
SELECT * FROM groups AS g LEFT OUTER JOIN user_group_cmbs AS cmb ON g.id = cmb.group_id WHERE cmb.user_id = 1
我试图在下面设置协会,但我不知道该做什么.
class Group < ActiveRecord::Base has_many :user_group_cmb end class UserGroupCmb < ActiveRecord::Base has_many :group end
Rails版本:3.1.1