ruby-on-rails - rails :dependent and :delete

Question

我正在运行 Rails 2.0.2，但无法在我的 AR 关联中使用 :dependent => :delete

 has_many :items, :dependent => :delete

我收到这个错误。

  The :dependent option expects either :destroy, :delete_all, or :nullify (:delete)

我无法找到 :delete_all 的文档来查看它是否符合我的要求。它基本上与删除相同吗？ :delete 是最近添加到 Rails 中的，而不是我正在使用的版本吗？

Answer 1

这是 relevant documentation for Rails 2.0.2 :

if set to :destroy all the associated objects are destroyed alongside this object by calling their destroy method. If set to :delete_all all associated objects are deleted without calling their destroy method. If set to :nullify all associated objects’ foreign keys are set to NULL without calling their save callbacks.

railsbrain.com 是查找特定 Rails 版本特定文档的好地方。