带有 accepts_nested_attributes_for 的 Paper_trail [英] Paper_trail with accepts_nested_attributes_for

问题描述

我有一个包含文章的 rails 应用程序，用户可以将链接和评论添加为嵌套属性.

I have a rails app that has articles that and the user can add links and reviews as nested attributes.

我在 paper_trail https://github.com/airblade/paper_trail/ 文档中看到这不是那颗宝石所涵盖的.我将如何设置撤消功能，以便在用户单击撤消时恢复/更新嵌套属性或 has_many 关联?

I saw in the paper_trail https://github.com/airblade/paper_trail/ documentation that this is not covered by that gem. How would I go about setting up undo functionality so that nested attributes or has_many associations are restored/updated when a user clicks undo?

推荐答案

我认为，如果您将销毁"帖子连接到撤消按钮，它至少会删除链接(如果它们单击撤消).基本上，您使用特殊的 _destroy 键传递一个哈希值，它将删除嵌套的模型记录.

I think if you hook in a "destroy" post to the undo button it will at least remove the links if they click undo. Basically you pass a hash with the special _destroy key it will remove the nested model records.

来自 Rails 3 文档此处:

From Rails 3 docs here:

class Member < ActiveRecord::Base
   has_one :avatar
   accepts_nested_attributes_for :avatar, :allow_destroy => true
end

现在，当您将 _destroy 键添加到属性哈希值时，如果值为 true，您将销毁关联的模型:

Now, when you add the _destroy key to the attributes hash, with a value that evaluates to true, you will destroy the associated model:

member.avatar_attributes = { :id => '2', :_destroy => '1' }
member.avatar.marked_for_destruction? # => true
member.save
member.reload.avatar # => nil

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