按页面元数据过滤收集项 [英] Filter Collection Items by page metadata

问题描述

我有一个名为product-categories的jekyll集合，其中每个文件的开头都有以下元数据:

I have a jekyll collection called product-categories in which each file has the following metadata in front matter:

_product-categories/filename1.md

---
- title
- uuid
---

我有一个页面，其首页的内容包含此集合中的文件名(集合数组选择通过其带有首页内容的文件名保存)...

I have a page whose front matter contains filenames from this collection (collection array selections are saved by their filenames with front matter)...

page.html

---
product-categories:
  - filename1
  - filename2
---
[list of product-categories to be displayed here]

目标

我想在页面上显示这些product-categories的 title (来自集合元数据).由于项目是通过文件名保存在最前面的，所以这不可能吗?

Goal

I want to display the title (from the collection metadata) of these product-categories on the page. Since the items are saved in the front matter by their filename, shouldn't this be possible?

推荐答案

您可以这样做:

{% comment %} --- Get product-categories collection's datas --- {% endcomment %}
{% assign collection = site.collections | where: "label", "product-categories" | first %}

{% comment %} --- collection's docs root path --- {% endcomment %}
{% assign collection_path = collection.relative_directory | append: "/" %}

<ul>
{% for cat in page.product-categories %}

  {% comment %} --- expected file path --- {% endcomment %}
  {% assign filepath = collection_path | append: cat | append:".md" %}

  {% comment %} Look for files that have path == filepath.
                As "where" filter return an array,
                we pick the first and only item in array  {% endcomment %}
  {% assign file = site.product-categories | where:"path", filepath | first %}

  {% if file %}
    <li>{{ file.title }}</li>
  {% else %}
    {% comment %} --- error in front matter list ---{% endcomment %}
    <li>No file match for <strong>{{ cat }}</strong> : file at <strong>{{ filepath }}</strong> not found</li>
  {% endif %}

{% endfor %}
</ul>

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