如何使用CanCanCan与枚举场？ [英] How to use CanCanCan with enum field?

问题描述

我的文章模型枚举字段枚举状态：[：悬而未决，：做]。

下面是我的能力，文件

 类能力
  包括惨惨::能力  高清初始化（用户）
    用户|| = User.new    如果user.member？
      可以：阅读，Article.done
    结束
  结束
结束
 

在视图中我试图呈现的 Article.done 收集成员，但没有任何事情渲染。

 ＆LT;若能％？ ：读，Article.done％GT;
  ＆LT;％=渲染部分：'文章'，收藏：Article.done，如：本文％GT;
＆LT;％结束％GT;
 

所以我有一个问题：有没有可能在CanCanCan与枚举的工作方式

解决方案

我可能是错的，，但我认为枚举仅创建实例方法：。

  @article = Article.find PARAMS [：ID]
@ article.done？
 

我的已的错误 ...

  基于枚举字段的允许值

斯科普斯将提供
  为好。与上面的例子：

  Conversation.active
Conversation.archived
 

-

我会删除此，如果它不能正常工作;我会评估对环境的散，不类本身：

 类能力
  包括惨惨::能力  高清初始化（用户）
    用户|| = User.new    如果user.member？
      可以：阅读，文章，状态：Article.statuses [：做]
    结束
  结束
结束
 

---

更新

要考虑几个重要的事情。

首先，使用散条件时：

  

重要信息：如果存在一个块或条件的哈希值的一类检查时，他们会被忽略，并且将返回true。

这意味着你不能调用一个能力，而路过的一类，它在一个对象的实例被称为特定条件。

其次，似乎 CanCanCan有一些问题，评估枚举值，这使得需要以下code：

 ＃应用程序/模型/ ability.rb
一流的能力
  包括惨惨::能力  高清初始化（用户）
    用户|| = User.new
    如果user.member？
      能：读，做条|文章|
        article.done？
      结束
    结束
  结束
结束
 

然后，您需要到文章实例传递给可方法：

 ＃应用程序/视图/用品/ index.html.erb
＆LT;表＆gt;
    ＆所述;％=渲染@articles％GT;
＆LT; /表＆gt;＃应用程序/视图/条/ _article.html.erb
＆LT;％如果能？ ：阅读，文章％GT;
    ＆所述; TR＆GT;
      ＆所述; TD＆GT;标题：其中; / TD＆GT;
      ＆所述; TD＆GT;＆下;％= article.title％GT;＆下; / TD＆GT;
      ＆所述; TD＆GT;＆下;％= article.status％GT;＆下; / TD＆GT;
    ＆LT; / TR＆GT;
＆LT;％结束％GT;
 

I got Article model with enum field enum status: [:pending, :done].

Here's my ability file

class Ability
  include CanCan::Ability

  def initialize(user)
    user ||= User.new

    if user.member?
      can :read, Article.done
    end
  end
end

In view I am trying to render Article.done collection for member but nothings renders.

<% if can? :read, Article.done %> 
  <%= render partial: 'article', collection: Article.done, as: :article %>
<% end %>

Therefore I have a question: is there any possible way to work with enum in CanCanCan?

解决方案

I may be wrong, but I think that enum only creates instance methods:.

@article = Article.find params[:id]
@article.done?

I was wrong...

Scopes based on the allowed values of the enum field will be provided as well. With the above example:

Conversation.active
Conversation.archived

--

I'll delete this if it doesn't work; I would be evaluating against the hash of conditions, not the class itself:

class Ability
  include CanCan::Ability

  def initialize(user)
    user ||= User.new

    if user.member?
      can :read, Article, status: Article.statuses[:done]
    end
  end
end

---

Update

Several important things to consider.

Firstly, when using hash conditions:

Important: If a block or hash of conditions exist they will be ignored when checking on a class, and it will return true.

This means that you cannot call specific conditions on an "ability" whilst passing a class, it has to be called on an instance of an object.

Secondly, it seems CanCanCan has some issues evaluating enum values, which makes the following code necessary:

#app/models/ability.rb
class Ability
  include CanCan::Ability

  def initialize(user)
    user ||= User.new
    if user.member?
      can :read, Article do |article|
        article.done?
      end
    end
  end
end

You then need to pass the article instance to the can? method:

#app/views/articles/index.html.erb
<table>
    <%= render @articles %>
</table>

#app/views/articles/_article.html.erb
<% if can? :read, article %>
    <tr>
      <td>Title:</td>
      <td><%= article.title %></td>
      <td><%= article.status %></td>
    </tr>
<% end %>

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