扶手：依赖=＆GT; ：摧毁VS：依赖=＆GT; ：删除所有 [英] Rails :dependent => :destroy VS :dependent => :delete_all

问题描述

在轨指南，它是这样描述的：

In rails guides it's described like this:

对象将除了破坏，如果他们与相关：依赖=＆GT; ：摧毁和删除，如果他们正在与相关：依赖=＆GT; ：DELETE_ALL

Objects will be in addition destroyed if they’re associated with :dependent => :destroy, and deleted if they’re associated with :dependent => :delete_all

右键，冬暖夏凉。但是，什么是被破坏和被删除的区别？
我都尝试，它似乎做同样的事情。

Right, cool. But what's the difference between being destroyed and being deleted? I tried both and it seems to do the same thing.

推荐答案

不同的是与回调。

的：DELETE_ALL 是直接在应用程序和SQL删除：

The :delete_all is made directly in your application and deletes by SQL :

DELETE * FROM users where compagny_id = XXXX

随着：摧毁，有所有你的孩子的一个实例。所以，如果你不能破坏它，或者如果每个人都有自己的：依赖，它的回调可以被称为

With the :destroy, there is an instantiation of all of your children. So, if you can't destroy it or if each has their own :dependent, its callbacks can be called.

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