rails缓存:另一个命名空间中的expire_action

问题描述

我的应用程序将命名空间用于管理目的.我最近尝试开始使用动作缓存，但是在尝试使用 expire_action 使缓存过期时遇到了一些问题.基本上，我的默认命名空间 newsposts 控制器中有一个索引操作，它使用如下操作缓存进行缓存:

My application is using a namespace for administrative purposes. I recently tried to start using action caching however I ran into some problems trying to expire the cache using expire_action. Basically I have a index action in my default namespace newsposts controller that is cached using action caching like this:

class NewspostsController < ApplicationController

  caches_action :index, :layout => false

  def index
    @posts = Newspost.includes(:author).order("created_at DESC").limit(5)
  end

end

这会缓存views/host/newsposts下的视图.

This caches the view under views/host/newsposts.

默认命名空间没有修改数据的操作，它们都在我的管理命名空间中.在我的 Admin::NewspostsController 中，我试图在创建操作中使此缓存过期，如下所示:

The default namespace has no actions for modifying data, they are all in my admin namespace. In my Admin::NewspostsController I am trying to expire this cache in the create action like this:

expire_action(:controller => 'newsposts', :action => 'index')

但是，这将使位于views/host/admin/newsposts 下的缓存文件过期.显然它不能工作，因为我在 admin 命名空间中，并且 rails 正在(正确地)寻找这个命名空间的过期缓存.遗憾的是我无法将命名空间参数传递给 axpire_action 方法，那么如何使另一个命名空间中的操作缓存过期?

however this will expire a cache file located under views/host/admin/newsposts. Obviously it can not work since im in the admin namespace and rails is (rightfully) looking to expire cache for this namespace. Sadly I can not pass a namespace parameter to the axpire_action method, so how can i expire the action cache in another namespace?

推荐答案

经过一番挖掘，我终于找到了解决方案.在 url_for 方法中有点暗示:

after some more digging I finally found the solution. It's a bit hinted in the url_for method:

特别是，前导斜杠确保不假定命名空间.因此，如果当前控制器位于该模块下，则 url_for :controller => 'users' 可能会解析为 Admin::UsersController，但 url_for :controller => '/users' 确保无论如何链接到 ::UsersController.

In particular, a leading slash ensures no namespace is assumed. Thus, while url_for :controller => 'users' may resolve to Admin::UsersController if the current controller lives under that module, url_for :controller => '/users' ensures you link to ::UsersController no matter what.

基本上，

expire_action(:controller => '/newsposts', :action => 'index')

将在默认命名空间中过期，并且

Will expire in the default namespace, and

expire_action(:controller => 'admin/newsposts', :action => 'index')

在管理命名空间中(默认时).

in the admin namespace (when in default).

RailsCast

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