Ruby on Rails中的嵌套包含3

Question

在Ruby on Rails中,我有一个有很多孩子的学校.儿童有很多活动.和Activity有一个activity_types.我需要帮助嵌套包括.在我的儿童控制器.我有这个......哪个有效.

s = School.find(params[:school_id])
@school = s
@children = s.children.includes(:activities).all

但我想从孩子们的活动中获取:activity_type.我试过这个

s = School.find(params[:school_id])
@school = s
@children = s.children.includes(:activities => :activity_types).all

但那没用

Answer 1

不要多元化activity_type.

s.children.includes(:activities => :activity_type).all