在has_many:through关系中,是否有一种简单的方法可以删除关联?
如果我有模特:
deal.rb
class Deal < ActiveRecord::Base
has_many :deal_events
has_many :events, :through => :deal_events
end
event.rb
class Event < ActiveRecord::Base
has_many :deal_events
has_many :deals, :through => :deal_events
end
deal_event.rb
class DealEvent < ActiveRecord::Base
belongs_to :deal
belongs_to :event
end
并在控制台中:
deal = Deal.first
event = Event.first
deal.events << event
我知道如果我想破坏交易和事件的关联,我知道我可以打电话
deal.events.destroy(event)
event.deals.destroy(deal)
但是deal.deal_events和event.deal_events仍然包含deal_event ..是否有更简洁的方法来完成此操作并完全删除关系并让事件保留在Event.all中并且交易仍在Deal.all中?感谢
Rails控制台欺骗了我..
我做完之后
deals.events << event
Rails没有输入查询,因为event.deal_events的查询已经执行了所以这个..
1.9.3-p327 :020 > event.deal_events
=> []
正在发生,但当我退出并再次进入rails console时,则执行查询..
1.9.3-p327 :001 > event.deal_events
DealEvent Load (0.9ms) SELECT "deal_events".* FROM "deal_events" WHERE "deal_events"."event_id" = 1
=> [#<DealEvent id: 2, deal_id: 1, event_id: 1, created_at: "2013-01-15 21:37:24", updated_at: "2013-01-15 21:37:24">, #<DealEvent id: 3, deal_id: 1, event_id: 1, created_at: "2013-01-15 21:37:38", updated_at: "2013-01-15 21:37:38">]
我会将@ChapleyWatson标记为答案,因为它指出了我正确的方向
答案 0 :(得分:0)
在您的父模型
中before_destroy :clear_my_association
# model stuff
private
def clear_my_association
self.my_association_model.clear
end