为什么不accepts_nested_attributes_for allow_destroy不工作？ [英] Why doesn't accepts_nested_attributes_for allow_destroy not work?

问题描述

我有一个嵌套的属性/资源，我正在试图摧毁。我想要做的是摧毁审查对象，当相关life_hack文章对象被销毁。现在，我也不太清楚了accepted_as_nested_attributes是如何工作的，但我是pretty的肯定，这是我需要做的方式。下面我有一些路线定义为这样：

I have a nested attribute/resource, that I'm trying to destroy. What I want to do is to destroy a review object, when an associated life_hack article object is destroyed. Now I'm not too sure how the accepted_as_nested_attributes work but I'm pretty sure this is the way that I need to do it. Below i have some routes defined as so:

Hacklife::Application.routes.draw do
  devise_for :users
  root 'life_hacks#index'

  resources :life_hacks, only: [:new, :index, :create, :show, :destroy] do
    resources :reviews, only: [:new, :create]
  end

  resources :reviews, only: [:show] do
    resources :comments, only: [:new, :create]
  end

下面是我的LifeHack文章模型：

Below is my LifeHack article model:

class LifeHack < ActiveRecord::Base
 validates :title, presence: true
 validates :content, presence: true

 belongs_to :user
 has_many :reviews, dependent: :destroy
 accepts_nested_attributes_for :reviews, allow_destroy: true
end

我的审查模式：

My Review Model:

class Review < ActiveRecord::Base
validates :title, presence: true
validates :body, presence: true
validates :rating, presence: true, numericality: { only_integer: true, greater_than: 0,     
less_than_or_equal_to: 6 }

has_many :comments
belongs_to :user
belongs_to :life_hack
end

现在我不太知道如何解决这个问题。通过审判错误我用两个accepted_as_attribute_for允许破坏和普通的has_many destory方法，但没有用。难道还有错的财产以后或许在控制器文件，或者也许有一个没有被在审查模式指定的东西吗？从我的理解，如果你有一个嵌套的资源，你需要使用一个accepts_nested_attributes_for：东西allow_destroy：如此才能为它工作。至少这就是ActiveRecord的导轨导向使得它的声音。有什么想法吗？ THX。

Now I'm not quite sure how to fix this. Through trial by error I've used both the accepted_as_attribute_for allow destroy and the regular has_many destory methods but to no use. Could there be somthing wrong perhaps in a controller file, or maybe there is something that is not being specified in the review model? From what I understand, if you have a nested resource, you need to use an accepts_nested_attributes_for :something allow_destroy: true in order for it to work. At least that's what the activerecord rails guide made it sound. Any thoughts? Thx.

推荐答案

您可以使用 _destroy 键破坏现有的记录。

You can use the _destroy key to destroy existing records.

根据指南此参考：

As per this reference guide:

：allow_destroy

:allow_destroy

如果属实，破坏从属性的所有成员凑了_destroy   键和值计算结果为真（如：1，'1'，真的，或者true）。   此选项默认是关闭的。

If true, destroys any members from the attributes hash with a _destroy key and a value that evaluates to true (eg. 1, '1', true, or 'true'). This option is off by default.

如果你可以只显示控制器的详细信息，我们可以更好的为您提供帮助。希望它可以帮助：）

If you could just show the controller details, we could better assist you. Hope it helps :)

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