mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-21 20:46:30 -05:00
57 lines
1.8 KiB
Markdown
57 lines
1.8 KiB
Markdown
|
---
|
||
|
|
title: intersect
|
||
|
|
linktitle: intersect
|
||
|
|
description: Returns the common elements of two arrays or slices.
|
||
|
|
godocref:
|
||
|
|
date: 2017-02-01
|
||
|
|
publishdate: 2017-02-01
|
||
|
|
lastmod: 2017-02-01
|
||
|
|
categories: [functions]
|
||
|
|
menu:
|
||
|
|
docs:
|
||
|
|
parent: "functions"
|
||
|
|
#tags: []
|
||
|
|
signature: ["intersect SET1 SET2"]
|
||
|
|
workson: []
|
||
|
|
hugoversion:
|
||
|
|
relatedfuncs: []
|
||
|
|
deprecated: false
|
||
|
|
aliases: []
|
||
|
|
---
|
||
|
|
|
||
|
|
The elements supported are strings, integers, and floats (only float64).
|
||
|
|
|
||
|
|
A useful example of `intersect` functionality is a "related posts" block. `isset` allows us to create a list of links to other posts that have tags that intersect with the tags in the current post.
|
||
|
|
|
||
|
|
The following is an example of a "related posts" [partial template][partials] that could be added to a [single page template][single]:
|
||
|
|
|
||
|
|
{{< code file="layouts/partials/related-posts.html" download="related-posts.html" >}}
|
||
|
|
<ul>
|
||
|
|
{{ $page_link := .Permalink }}
|
||
|
|
{{ $tags := .Params.tags }}
|
||
|
|
{{ range .Site.Pages }}
|
||
|
|
{{ $page := . }}
|
||
|
|
{{ $has_common_tags := intersect $tags .Params.tags | len | lt 0 }}
|
||
|
|
{{ if and $has_common_tags (ne $page_link $page.Permalink) }}
|
||
|
|
<li><a href="{{ $page.Permalink }}">{{ $page.Title }}</a></li>
|
||
|
|
{{ end }}
|
||
|
|
{{ end }}
|
||
|
|
</ul>
|
||
|
|
{{< /code >}}
|
||
|
|
|
||
|
|
This is also very useful to use as `AND` filters when combined with where:
|
||
|
|
|
||
|
|
```
|
||
|
|
{{ $pages := where .Site.RegularPages "Type" "not in" (slice "page" "about") }}
|
||
|
|
{{ $pages := $pages | union (where .Site.RegularPages "Params.pinned" true) }}
|
||
|
|
{{ $pages := $pages | intersect (where .Site.RegularPages "Params.images" "!=" nil) }}
|
||
|
|
```
|
||
|
|
|
||
|
|
The above fetches regular pages not of `page` or `about` type unless they are pinned. And finally, we exclude all pages with no `images` set in Page params.
|
||
|
|
|
||
|
|
See [union](/functions/union) for `OR`.
|
||
|
|
|
||
|
|
|
||
|
|
[partials]: /templates/partials/
|
||
|
|
[single]: /templates/single-page-templates/
|