液体标记/液体模板中的递归 [英] Recursion in Liquid Markup / Liquid Templates

问题描述

我一直在尝试找出如何使用液体进行递归.我有一个应用程序，我想让用户完全控制菜单的呈现.但是，菜单是由树定义的，因此需要在Liquid中使用递归函数.

I've been trying to figure out how I'm gonna do recursion with Liquid. I have an app where I want to give users full control over the rendering of the menu. However, the menu is defined by a tree, thus the need for recursive functions in Liquid.

我将如何处理?阅读后，我想我可以这样解决:

How would I go about this? After doing some reading, I was thinking I'd tackle it this way:

包含

我当时正在考虑以这种方式使用include:

I was thinking of using include this way:

<ul id='site_nav' class='nav'>
  {{ include 'menu_item' with menu_items }}
</ul>

menu_item部分是这样的:

And the menu_item partial is this:

<li id='{{menu_item.dom_id}}' class='{{menu_item.css_menu_class}}'>
  {{ menu_item.name }}
  <ul>
    {{ include 'menu_item' with menu_item.children }}
  </ul>
</li>

但是，由于它是用户可编辑的，因此我需要破解Liquid以使其从数据库中加载部分内容.由于那将花费更多的时间来研究，因此我想先问一下是否有人解决过这个问题.

However, since it's user editable, I'll need to hack Liquid to make it load partials from a database. Since that will take a lot more time to study, I wanted to ask first if anyone has tackled this problem before.

• 如果您之前已经解决了这个问题，那么您如何递归渲染某些内容并使其可被用户编辑?
• 如果您以前没有解决过这个问题，您会建议我采取什么方式?我上面详述的方式?

提前谢谢！

推荐答案

您实际上并不需要破解" Liquid来从DB加载部分文件，只需扩展提供的文件系统类，请阅读以下内容以了解更多信息:

You don't actually need to 'hack' Liquid to load partials from the DB, simply extend the provided file system classes, read the following for more info:

https://github.com/Shopify/liquid/blob/master/lib/liquid/file_system.rb

我在自己之前就已经实现了Liquid，如果您知道您会使用Ruby，我可以证明它并不是特别困难.

I've implemented Liquid this way before myself, and I can vouch for it not being particularly difficult if you know you're way around Ruby.

对于递归，Liquid可能不会对其进行限制(您的模板示例应该可以使用)，但是我将用Timeout :: timeout包装您的呈现过程(请参见下面的链接)，以确保它不会消失永远.

As for the recursion, Liquid probably won't limit it (your template examples should just work), but I'd wrap your rendering process with a Timeout::timeout (see link below) to ensure it doesn't go on forever.

http://www.ruby- doc.org/stdlib-1.9.3/libdoc/timeout/rdoc/Timeout.html

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