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我正在尝试返回基于附加到它的 HTML 的格式化消息，这是我在模块内创建的一个库，用于在消息内容中设置表格样式，并且消息本身基于主题。这是我做的

Drupal->modules->custom->mailify->css->my_library.css

table {
  font-family: arial, sans-serif;
  border-collapse: collapse;
  width: 100%;
}

td, th {
  border: 1px solid #dddddd;
  text-align: left;
  padding: 8px;
}

tr:nth-child(even) {
  background-color: #dddddd;
}

Drupal->modules->custom->mailify->mailify.libraries.yml

mailify-library:
   version: 1.x
   css:
      header: true
      theme:
         css/my_library.css: {}

Drupal->modules->custom->mailify->templates->mailify-hello-world-salutation.html.twig

<div {{ attributes }}>
<table>
  <tr>
    <th>Key</th>
    <th>Value</th>
  </tr>
  <tr>
    <td>Host</td>
    <td>{{ host }}</td>
  </tr>
  <tr>
    <td>SMTPAuth</td>
    <td> {{ smtpauth }} </td>
  </tr>
  <tr>
    <td>Username</td>
    <td>{{ username }}</td>
  </tr>
  <tr>
    <td>Password</td>
    <td>{{ password }}</td>
  </tr>
  <tr>
    <td>Port</td>
    <td> {{ port }}</td>
  </tr>
</table>
</body>
</div>

Drupal->modules->custom->mailify->mailify.module

/**
 * Implements hook_theme().
 */
function mailify_theme($existing, $type, $theme, $path)
{
    return [
        'mailify_hello_world_salutation' => [
            'variables' => [
                'host' => NULL,
                'smtpauth' => NULL,
                'username' => NULL,
                'password' => NULL,
                'port' => NULL,
                'overridden' => FALSE
            ]
        ]
    ];
}

/**
 * Default preprocessor function for the mailify_hello_world_salutation theme hook.
 */
function template_preprocess_mailify_hello_world_salutation(&$variables)
{
    $variables['attributes'] = [
        'class' => [
            'mailify'
        ]
    ];
}

Drupal->modules->custom->mailify->src->Plugin->rest->resource->RestSample.php

class RestSample extends ResourceBase
{
    /**
     * 
     * @var \Drupal\Core\Config\ConfigFactoryInterface
     */
    protected $configFactory;
    
    /**
     * Constructs a Drupal\Plugin\rest\resource\RestSample 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 array $serializer_formats
     *   The available serialization formats.
     * @param \Psr\Log\LoggerInterface $logger
     *   A logger instance.
     * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
     *    
     */
    public function __construct($configuration, $plugin_id, $plugin_definition, $serializer_formats, $logger, $config_factory) {
        parent::__construct($configuration, $plugin_id, $plugin_definition, $serializer_formats, $logger);
        $this->configFactory = $config_factory;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
        return new static(
            $configuration,
            $plugin_id,
            $plugin_definition,
            $container->getParameter('serializer.formats'),
            $container->get('logger.factory')->get('rest'),
            $container->get('config.factory'),
            );
    }
    
    public function post()
    {
        // You must to implement the logic of your REST Resource here.
        $render = [
            '#theme' => 'mailify_hello_world_salutation'
            
            '#attached' => [
                'library' => [
                    'mailify/mailify-library',
                 ],
             ],
         
        ];
    
        $to = 'joe@example.net';
        $langcode = $this->configFactory->get('system.site')->get('langcode');
        $config = $this->configFactory->get('mailify.custom_mailable');

        $render['#host'] = $config->get('host');
        $render['#smtpauth'] = $config->get('smtpauth');
        $render['#username'] = $config->get('username');
        $render['#password'] = $config->get('password');
        $render['#port'] = $config->get('port');

        try {
            $result = \Drupal::service('plugin.manager.mail')->mail('mailify', 'mailgenix', $to, $langcode, [
                'message' => \Drupal::service('renderer')->renderRoot($render),
                'subject' => 'postmail'
            ]);

            $response = null;
            $data = null;

            if ($result) {
                $data[]['message'] = 'Message has been sent';
            } else {
                $data[]['message'] = 'Message could not be sent';
                $data[]['status'] = 400;
            }
            $response = new ResourceResponse($data[0], $data[1]['status'] ?? 200);
            // In order to generate fresh result every time (without clearing
            // the cache), you need to invalidate the cache.
            $response->addCacheableDependency($data);
            return $response;
        } catch (\Exception $e) {
            $response = new ResourceResponse("Message could not be sent. Mailer Error: " . $e->getMessage(), 500);
            $response->addCacheableDependency($data);
            return $response;
        }
    }
}

我首先使用了函数renderPlain然后renderRoot并且两次消息都返回了未设置样式。请注意，当我单独使用渲染函数时，我收到一个错误，提示我过早地尝试渲染。有人可以帮我找出原因吗？我对库的定义是否有错误，或者我应该为渲染器使用另一个函数？

注意：我肯定使用了自定义插件RestSample上的注解

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