[FIXED] How can I create condition "if there is no event belonging to the selected category" in Symfony twig?

Issue

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 %}

Solution

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 %}

Answered By - Harvey Dent

Answer Checked By - Dawn Plyler (PHPFixing Volunteer)