Tags and subtags in one array?

The CMS Questions
1

Hi,

I’d like to work with tags and subtags.

The first page tag would be the main one, and the following ones would be the sub-tags.
Example for an article: first tag-> “News”, second tag → “News subtag”
Example for another article: first tag-> “Events”, second tag → “Events subtag”, third tag → “Events subtag 2”

How can I change my code here to fetch only first tags in the filter menu?
And then under each filter menu <li> fetch all the tags that are coming in second but have the same first tag? Would that be possible?

<?php
    $filterBy = get('filter');
    $unfiltered = $page->children()->sortBy('date', 'desc');
    $chronicles = $unfiltered
        ->when($filterBy, function($filterBy) {
            return $this->filterBy('Tags', $filterBy, ',');
        });


    $filters = $unfiltered->pluck('Tags', ',', true);
    ?>

<?php foreach ($filters as $filter): ?>
<li class="<?= $filter ?>">
<a href="<?= $page->url() ?>?filter=<?= $filter ?>"><?= $filter ?></a><span></span>
</li>
<?php endforeach ?>

Thanks in advance for the help.
Bests

2

I am not sure I understand the content 100%. Your content file looks like this?

Tags: Events, Events subtag, Events subtag 2

And now you want to get a list from only the first tag of all pages?

3

Thank you for your answer.

The content file contains all article at the same level.

They all have multiple tags.
Capture d’écran 2025-01-01 à 15.12.46

I want to make a filter menu with the principal tags (first ones) as first hierarchy and the seconds as subfilters.
For example;

  • News
    –– Store news
    –– Membership news
    –– Releases

  • Events
    –– Speeches
    –– Concerts

Is it possible like this, or do I have to do it differently?
Thank you very much

4

I think for general convenience I would add a custom page model (Page models | Kirby CMS) adding a method that returns only the main tag, e.g.

class EventPage extends \Kirby\Cms\Page
{
	public function topTag(): string
	{
		return $this->tags()->split(',')[0];
	}
}

Which you could then use for your ->pluck() call.

$filters = $unfiltered->pluck('topTag', unique: true);