I'd like to show an element if there is no event belonging to the category. Before landing on list of events user has selected a category previously in a search form.
How can I write a condition saying 'if there is no event belonging to the selected category' ?
I tried this but I ended up with this error :
Key "category" for array with keys "0" does not exist.
My code on twig :
{% if events.category.id != category.id %}
<a href="#">Comment participer ?</a>
{% endif %}
CodePudding user response：
From the error text it seems that your events variable is an array of objects, so you can't use .category.id in a condition without a loop. You need a loop to determine if the event is set with the category you want in the array, if not, display your message
{% set event_isset = false %}
{% for event in events %}
{% if event.category.id == category.id %}
{% set event_isset = true %}
{% endif %}
{% endfor %}
{% if not event_isset %}
<a href="#">Comment participer ?</a>
{% endif %}
CodePudding user response：
If your events is an array of objects/arrays each of which has key category then this condition should work:
{% if events|filter(e => e.category == category.id)|length == 0 %}
...
{% endif %}