评价：依赖=＆GT; ：破坏 [英] Evaluating :dependent => :destroy

问题描述

在Rails 2.2.2（红宝石1.8.7-P72），我想，以评估之前，实际上这样做破坏物体的影响。即我想是能够产生会受到所有对象的列表：依赖=>：破坏（通过一个对象的关联）。真正的问题，我试图解决的是让用户将被删除的所有内容的列表，并让他们确认操作。

In Rails 2.2.2 (ruby 1.8.7-p72), I'd like to evaluate the impact of destroying an object before actually doing it. I.e. I would like to be able to generate a list of all objects that will be affected by :dependent => :destroy (via an object's associations). The real problem I'm trying to solve is to give a user a list of everything that will be deleted and having them confirm the action.

谁能推荐一个很好的方法来进行此事？我刚刚开始寻找到的ActiveRecord ::协会，但我还没有取得很大进展。

Can anyone recommend a good way to go about this? I've just started looking into ActiveRecord::Associations, but I haven't made much headway.

更新：在我的具体情况，我已经得到了不同程度的对象（A - > B - > C）

Update: In my particular case, I've got various levels of objects (A --> B --> C).

推荐答案

这应该可以帮助您开始......很明显，我们需要自定义，但这种列出了所有协会名称是依赖销毁类BlogEntry：

This should help get you started... Obviously you'll have to customize it but this lists all association names that are dependent destroy on the class BlogEntry:

BlogEntry.reflect_on_all_associations.map do |association|
  if association.options[:dependent] == :destroy
    # do something here...
    association.name
  end
end.compact
=> [:taggings, :comments]

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