“after_filter”如何/何时运行？ [英] How/when the 'after_filter' works/runs?
问题描述
我正在使用Ruby on Rails 3.1，我想知道（对于 performance 原因） after_filter 在该视图之后运行文件被渲染。也就是说，当用户访问我的应用程序的URL时，他/她应该显示的相关视图文件在 after_filter 运行或者 after_filter 在视图文件被渲染之前运行？
换句话说， application > server 在运行 after_filter 之前开始向用户发送呈现的视图数据，或者等待运行 after_filter 方法，然后才发送该视图数据？
：我打开这个问题，因为我想运行一些系统更新（ note ：这些更新不会影响视图输出数据，并且不会被/用于视图），而不会影响最终用户体验例如：缓慢加载我的应用程序网页）。
您必须知道，一致并运行在自己的线程中。
如果你把代码放在 after_filter 中，这会延迟整个请求：总结不好，如果线程还活着，页面是这就是为什么你找到像 DelayedJob 和 Resque ，它们在并行进程中工作，不会影响你的应用程序。
要回答你原来的问题， after_filter 在处理完视图后触发。
这有时是一个麻烦，所以人们创建了一些 before_render 过滤器。
I am using Ruby on Rails 3.1 and I would like to know (for performance reasons) whether or not the after_filter runs after that view files are rendered. That is, when an user access a my application URL, the related view file that he/she should display is rendered before that the after_filter runs or the after_filter runs before that the view file is rendered?
In other words, the application server starts to send the rendered view data to the user before to run the after_filter or it waits to run the after_filter method and only then it sends that view data?
P.S.: I opened this question because I would like to run some system updates (note: these updates doesn't affect the view output data and are not "used by"/"necessary to" the view at all) without impact on the end user experience (for example: slow loading of my application Web pages).
You have to be aware that a request to your server is fully consistent and runs in its own thread.
If you put code in an after_filter, this will delay the whole request: to sum up badly, if the thread is alive, the page is not delivered.
That's why you find great plugins like DelayedJob and Resque, they work in a parallel processes and won't affect your app.
To answer your original question , after_filter are triggered after the view has been processed.
This is sometimes a hassle that's why people created some before_render filters.
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