GroupSearchProfileFieldsHandler.php

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<?php

namespace Elgg\Search;

class GroupSearchProfileFieldsHandler {

    public function __invoke(\Elgg\Event $event) {
        $value = (array) $event->getValue();

        $defaults = [
            'metadata' => [],
        ];

        $value = array_merge($defaults, $value);

        $profile_fields = _elgg_services()->fields->get('group', 'group');
        foreach ($profile_fields as $field) {
            $value['metadata'][] = $field['name'];
        }

        return $value;
    }
}