如何使用应用程序装饰器来实现站点范围的视图逻辑？
在观看了最近的 Draper 上的 Railscasts 剧集之后，我想我应该尝试重构我的一些使用装饰器模式的东西。然后我立刻就迷惑了自己。
我的应用程序布局文件中有视图逻辑，它根据您是否登录（等待）提供登录或注销链接：
<% if signed_in? %>
<li><%= link_to "Sign out", signout_path, :method => :delete %></li>
<% else %>
<li><%= link_to "Sign in", signin_path %></li>
<% end %>
似乎是将该逻辑移至装饰器的完美候选者。但这是应用程序范围内的视图逻辑，那么我要装饰什么呢？我想我想创建一个应用程序装饰器，但我不清楚如何实例化应用程序装饰器对象以及如何引用它。
Railscasts 剧集确实展示了如何创建应用程序装饰器，但它是从特定控制器（即不是应用程序控制器）内引用的。如何构建事物以便可以从网站上的每个页面访问装饰视图逻辑？
After watching the recent Railscasts episode on Draper I thought I'd have a go at refactoring some of my stuff to make use of the Decorator pattern. And then instantly managed to confuse myself.
I have view logic in my application layout file that provides login or logout links depending on whether (wait for it) you're logged in or not:
<% if signed_in? %>
<li><%= link_to "Sign out", signout_path, :method => :delete %></li>
<% else %>
<li><%= link_to "Sign in", signin_path %></li>
<% end %>
Seems like a perfect candidate for moving that logic into a decorator. But this is an app wide bit of view logic, so what am I decorating? I guess I want to create an application decorator, but I'm unclear of how to instantiate the app decorator object and how to reference it.
The Railscasts episode does show how to create an app decorator, but it's referenced from within a specific controller (i.e. not the app controller). How do I structure things so I can access the decorated view logic from every page on the site?
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