Question 298597 in PHP Question posted in
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Php – In a Twig template, how can I group items in an array by the value of a property of an item?

In PHP I would do this:

$menu_groups = array();
foreach($items as $item){
    $menu_id = $item['properties.menu_id'];
    
    if(!array_key_exists($menu_id, $menu_groups)) $menu_groups[$menu_id] = array();
    
    $menu_groups[$menu_id][] = $item;
}

How can I accomplish something similar in a Twig template?

Tags:

2

Answers


  1. 0 
    you can do like this :  
{% set handledPeople = [] %}
    {% for person in people if person not in handledPeople %}
        <div class="colour_container">
            {% for p in people if p.colour == person.colour and p not in handledPeople %}
                <p>{{ p.firstname }} {{ p.surname }} - {{ p.colour }}</p>
                {% set handledPeople = handledPeople|merge([p]) %}
            {% endfor %}
        </div>
    {% endfor %}
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  2. 0

    as @pippo said in the comment templates should not contain the logic for better maitainability and testability and also for good practice of Symfony framework with twig as template engine. but if you insisted on knowing how you can do it I tried to transform your code from PHP to Twig and it should maybe look something like

    {% set menu_groups = items|group('properties.menu_id') %}
{% for menu_id, items in menu_groups %}
    <h2>MyMenuID : {{ menu_id }}</h2>
    <ul>
        {% for item in items %}
            <li>{{ item.name }}</li>
        {% endfor %}
    </ul>
{% endfor %}

    if your group filter is not defined in your twig then maybe try to create one

    1. First yo go to your src/Twig.
    2. Create a new class that extends TwigExtensionAbstractExtension (check doc here click)
    3. Don’t forget to declare your filter class in config/services.yaml

    then your new filter class should be like

    public function getFilters()
{
    return [
       new TwigFilter('group', [$this, 'groupArrayItemsBy']),
     ];
 }

public function groupArrayItemsBy(array $array, string $property)
{
    $result = [];
    foreach ($array as $item) {
        $key = $item[$property];
        if (!isset($result[$key])) {
           $result[$key] = [];
        }
        $result[$key][] = $item;
    }
    return $result;
}
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