mysql - Rails 依赖破坏所有

Question

如何在 Rails 中生成删除级联？

我有这些模型:

class UploadFile < ActiveRecord::Base
   has_many :purchases, dependent: :delete_all
end

class Purchase < ActiveRecord::Base
    has_many :purchasers,   dependent: :delete_all
    has_many :items,        dependent: :delete_all
    has_many :merchants,    dependent: :delete_all

    has_one :upload_file
end

class Item < ActiveRecord::Base
end 

class Item < ActiveRecord::Base
end 

class Item < ActiveRecord::Base
end

当我删除 upload_file 时，只有 Purchase 的数据会被销毁。其余的仍然存在于数据库中。

我做错了什么？

Answer 1

你应该在这里使用 destroy_all 而不是 delete_all。

来自api dock :

destroy_all(conditions = nil) public

Destroys the records matching conditions by instantiating each record and calling its destroy method. Each object’s callbacks are executed (including :dependent association options and before_destroy/after_destroy Observer methods).