Drupal Twig variable initialization error

Question

The problem I'm trying to solve is this: I need a unique (but human readable) class name to be able to style Taxonomy Term page depending on the term shown. I unsuccessfully tried several approaches, the nearest being this:

Use standard Taxonomy Term View to display the page;
Calculate class name based on the path alias for the term;
Modify views-view.html.twig template to inject the class name above into one of the divs on the page.

My views-view.html.twig excerpt:

{% set tid = view.argument["tid"].value[0] %}
HEREITIS:{{tid}}<br/>
{% set pathclass = path('entity.taxonomy_term.canonical', {'taxonomy_term': 48}) | replace({'/': '-'}) %}
{%
  set classes = [
    dom_id ? 'js-view-dom-id-' ~ dom_id,
    tid,
    pathclass,
  ]
%}
<div{{ attributes.addClass(classes) }}>

And it produces the result that I could almost work with:

<!-- 💡 BEGIN CUSTOM TEMPLATE OUTPUT from 'sites/bezdatu.test/themes/qq/templates/views/views-view.html.twig' -->
HEREITIS:48<br/>
<div class="view-taxonomy-term contextual-region js-view-dom-id-8549dd661... 48 -category-holiday">

Note that both numbers "48" in the result come from tid variable and "-category-holiday" is correctly calculated based on the hardcoded "48" number. "Hardcoded" however is the only working scenario and I'm at total loss as to why changing

path('entity.taxonomy_term.canonical', {'taxonomy_term': 48})

to

path('entity.taxonomy_term.canonical', {'taxonomy_term': tid})

results in "an unexpected error" saying that I'm passing an empty value:

The website encountered an unexpected error. Try again later.

Symfony\Component\Routing\Exception\InvalidParameterException: Parameter "taxonomy_term" for route "entity.taxonomy_term.canonical" must match "[^/]++" ("" given) to generate a corresponding URL. in Drupal\Core\Routing\UrlGenerator->doGenerate() (line 202 of core/lib/Drupal/Core/Routing/UrlGenerator.php).

The variable is not empty, it is "48" and my only guess is that the twig template gets parsed before the variable value is calculated or view arguments become available. Is there any fix for this or any other simple approach to add path alias as css class name short of fiddling with Javascript?

Maybe another view is also being rendered? One that is not the taxonomy view, but would still be using the views-view.html.twig template? Try renaming your template file to something more specific for the taxonomy view so the template is only used for that view. — 2pha
– 2pha, Commented Sep 27, 2024 at 23:13
@2pha, this seems to be the case or at least the right direction to go. I'll need to fiddle a bit further, but initial tests look promising. Thank you! — Stanislav Kniazev
– Stanislav Kniazev, Commented Sep 28, 2024 at 9:09
@pha, yes, this is definitely the case — another view was using this template and the variable was not available there. Renaming the template to views-view--taxonomy-term.html.twig fixed the issue. — Stanislav Kniazev
– Stanislav Kniazev, Commented Sep 29, 2024 at 8:48
I'll put it as an answer so it can be marked as answered/accepted. Glad I could help. — 2pha
– 2pha, Commented Sep 29, 2024 at 22:41

2pha · Accepted Answer · 2024-09-29 22:41:49Z

1

Maybe another view is also being rendered? One that is not the taxonomy view, but would still be using the views-view.html.twig template? Try renaming your template file to something more specific for the taxonomy view so the template is only used for that view.

answered Sep 29, 2024 at 22:41

2pha

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