如何在 Rails 2 上级联删除
数据库设计：
contracts- id
- name
- id
- namecontract_id
- 我有这样的
- id
- allotment_id
- room_id
- 1contract has 1 allotment
- 1 allotment has N allotments_rooms
So…
Contract has_one :allotment, :dependent => :delete_all
Allotment belongs_to :contract
Allotment has_many :allotments_rooms, :dependent => :delete_all
Allotments_Rooms belongs_to :allotment
所以，当我删除合同时，Allotment被完美删除，但allotments_rooms却没有。
为什么？
谢谢你！
I have this DB design:
contracts
- id
- name
allotment
- id
- name
- contract_id
allotments_rooms
- id
- allotment_id
- room_id
- 1 contract has 1 allotment
- 1 allotment has N allotments_rooms
So…
Contract has_one :allotment, :dependent => :delete_all
Allotment belongs_to :contract
Allotment has_many :allotments_rooms, :dependent => :delete_all
Allotments_Rooms belongs_to :allotment
So, when I delete a Contract, the Allotment is perfectly removed, but the allotments_rooms are not.
Why?
Thank you!
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当您使用
:dependent =>; :delete_all，您销毁依赖记录没有调用他们的destroy方法，这样他们就没有机会销毁自己的关联记录。尝试:dependent => :delete代替。如果你想在数据库级别设置 FK 约束，我还建议使用 foreigner gem （尽管我不这样做）不知道它是否适用于 Rails 2)
when you use
:dependent => :delete_all, you destroy dependent records without calling their destroy method, so they have no chance to destroy their own associated records. Try:dependent => :deleteinstead.i would also recommend using the foreigner gem if you want to set FK constraints at DB level (though i don't know if it works with rails 2)