液体模板地图过滤器 [英] Liquid Template Map Filter

问题描述

如何使用Liquid中的地图过滤器？我在Jekyll使用它。

  --- 
 my_array：[apple，banana，orage] 
 my_map：
 hello：world 
 foo：bar 
 my_string：这是如何工作的？ 
 --- 
 {{page.my_map | map ...}} 
  

这就是我迷失的地方。我似乎无法找到任何在文档或其他地方在线使用它的例子。

顺便说一下，我不知道Ruby，但是，所以源代码对我而言并不清楚，要么。

从过滤器测试看起来像下面这样应该会产生一些东西，但是在GitHub上，我什么也没有得到：

  {{site.posts | map：'title'| array_to_sentence_string}} 
  

我希望我能得到类似于：

 我的第一篇博文，还有另一篇文章和第三篇文章
  

 <$ c $ 
 
 c> {{site.posts | map：'to_liquid'| map：'title'| array_to_sentence_string}} 
  

解释：

I认为 site.posts 正在返回一个 Post 实例，而不是返回它们的 to_liquid 版本（这感觉很奇怪 - 可能它是一个错误，你应该报告它） 。该类的实例不 respond_to？ ：title ，并且由于Liquid代码检查它，所以 map 返回所有实例的零。

How, exactly does one use the map filter in Liquid? I'm using it in Jekyll.

---
my_array: [apple, banana, orage]
my_map:
  hello: world
  foo: bar
my_string: "how does this work?"
---
{{ page.my_map | map ... }}

That's about where I get lost. I cannot seem to find any example of its usage in the docs or anywhere else online for that matter.

By the way, I do not know Ruby, yet, so the source code is not clear to me, either.

From the filter tests it looks like the following should produce something, but on GitHub, I am getting nothing:

{{ site.posts | map: 'title' | array_to_sentence_string }}

I would expect that I should get something like:

My First Blog Post, Yet Another Post, and Third Posts

解决方案

I was able to do what you want this way:

{{ site.posts | map: 'to_liquid' | map: 'title' | array_to_sentence_string }}

Explanation:

I think that site.posts is returning an array of Post instances instead of returning their to_liquid version (which feels very weird - probably it is a bug, you should report it). Instances of that class don't respond_to? :title, and since the Liquid code checks for that, the map returns nil for all instances.

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