Ruby on rails 在多个模型中建立与多个:通过的关联
请帮助了解如何使用此树进行Ruby on rails 在多个模型中建立与多个:通过的关联,ruby-on-rails,associations,Ruby On Rails,Associations,请帮助了解如何使用此树进行@project.payments: Project |__Stages |__Costs |__Payments project.rb has_many :stages has_many :costs, :through => stages has_many :payments, :through => costs stage.rb belongs_to :project has_many :c
@project.payments
:
Project
|__Stages
|__Costs
|__Payments
project.rb
has_many :stages
has_many :costs, :through => stages
has_many :payments, :through => costs
stage.rb
belongs_to :project
has_many :costs
has_many :payments :through => costs
cost.rb
belongs_to :stage
has_many :payments
payment.rb
belongs_to :cost
注意:由于这是一个嵌套的has_many:through关系,因此它只能在Rails 3.1+中工作(3.1中的RC4已退出) project.rb
has_many :stages
has_many :costs, :through => stages
has_many :payments, :through => costs
哦,太好了,谢谢!我将更新我的应用程序!我只是好奇,在Rails 3.0中有没有办法做到这一点?是的,有。看看我对这个问题的回答