Roles.php

<?php

namespace Drupal\user\Plugin\views\field;

use Drupal\Core\Database\Connection;
use Drupal\views\Plugin\views\display\DisplayPluginBase;
use Drupal\views\ViewExecutable;
use Drupal\views\Plugin\views\field\PrerenderList;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Field handler to provide a list of roles.
 *
 * @ingroup views_field_handlers
 *
 * @ViewsField("user_roles")
 */
class Roles extends PrerenderList {
    
    /**
     * Database Service Object.
     *
     * @var \Drupal\Core\Database\Connection
     */
    protected $database;
    
    /**
     * Constructs a \Drupal\user\Plugin\views\field\Roles object.
     *
     * @param array $configuration
     *   A configuration array containing information about the plugin instance.
     * @param string $plugin_id
     *   The plugin_id for the plugin instance.
     * @param mixed $plugin_definition
     *   The plugin implementation definition.
     * @param \Drupal\Core\Database\Connection $database
     *   Database Service Object.
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition, Connection $database) {
        parent::__construct($configuration, $plugin_id, $plugin_definition);
        $this->database = $database;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
        return new static($configuration, $plugin_id, $plugin_definition, $container->get('database'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {
        parent::init($view, $display, $options);
        $this->additional_fields['uid'] = [
            'table' => 'users_field_data',
            'field' => 'uid',
        ];
    }
    public function query() {
        $this->addAdditionalFields();
        $this->field_alias = $this->aliases['uid'];
    }
    public function preRender(&$values) {
        $uids = [];
        $this->items = [];
        foreach ($values as $result) {
            $uids[] = $this->getValue($result);
        }
        if ($uids) {
            $roles = user_roles();
            $result = $this->database
                ->query('SELECT u.entity_id AS uid, u.roles_target_id AS rid FROM {user__roles} u WHERE u.entity_id IN ( :uids[] ) AND u.roles_target_id IN ( :rids[] )', [
                ':uids[]' => $uids,
                ':rids[]' => array_keys($roles),
            ]);
            foreach ($result as $role) {
                $this->items[$role->uid][$role->rid]['role'] = $roles[$role->rid]
                    ->label();
                $this->items[$role->uid][$role->rid]['rid'] = $role->rid;
            }
            // Sort the roles for each user by role weight.
            $ordered_roles = array_flip(array_keys($roles));
            foreach ($this->items as &$user_roles) {
                // Create an array of rids that the user has in the role weight order.
                $sorted_keys = array_intersect_key($ordered_roles, $user_roles);
                // Merge with the unsorted array of role information which has the
                // effect of sorting it.
                $user_roles = array_merge($sorted_keys, $user_roles);
            }
        }
    }
    public function render_item($count, $item) {
        return $item['role'];
    }
    protected function documentSelfTokens(&$tokens) {
        $tokens['{{ ' . $this->options['id'] . '__role' . ' }}'] = $this->t('The name of the role.');
        $tokens['{{ ' . $this->options['id'] . '__rid' . ' }}'] = $this->t('The role machine-name of the role.');
    }
    protected function addSelfTokens(&$tokens, $item) {
        if (!empty($item['role'])) {
            $tokens['{{ ' . $this->options['id'] . '__role }}'] = $item['role'];
            $tokens['{{ ' . $this->options['id'] . '__rid }}'] = $item['rid'];
        }
    }

}