I am trying to write a custom filter for views. The goal is to filter by alias, but that’s not important now. It seems like I am missing a step to get view to recognize my filter hander after adding my filter in hook_views_data_alter as in the following:

/**  * Implements hook_views_data_alter().  */ function alias_views_filter_views_data_alter(array &$data) {   $data['node']['alias'] = [     'title' => t('alias filter'),     'filter' => [       'title' => t('alias filter'),       'help' => t('Provides a custom filter nodes by their alias.'),       'field' => 'nid',       'id' => 'entity_alias',     ],   ]; } 

I am able to get the filter to show in a view filter list. Now, my filter handler defined in /docroot/modules/custom/alias_views_filter/Plugin/views/filter/Alias.php but it does not seem to be picked up by views and I always get Broken/missing handler whenever I try to add the filter. Here is my handler definition:

<?php  namespace Drupalalias_views_filterPluginviewsfilter;  use DrupalviewsPluginviewsdisplayDisplayPluginBase; use DrupalviewsPluginviewsfilterStringFilter; use DrupalviewsViewExecutable; use DrupalCoreFormFormStateInterface;   /**  * Filters by alias.  *  * @ingroup views_filter_handlers  *  * @ViewsFilter("entity_alias")  */ class Alias extends StringFilter {      /**    * The current display.    *    * @var string    *   The current display of the view.    */   protected $currentDisplay;    /**    * @var views_plugin_query_default    */   public $query;    /**    * Constructs a new StringFilter 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 DrupalCoreDatabaseConnection $connection    *   The database connection.    */   public function __construct(array $configuration, $plugin_id, $plugin_definition, Connection $connection) {     parent::__construct($configuration, $plugin_id, $plugin_definition);     // this does seem to get evaluated at all ?     die('Death in handler');   }    protected function defineOptions() {     $options = parent::defineOptions();     $options['fields'] = ['default' => []];      return $options;   }    /**    * {@inheritdoc}    */   public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {     parent::init($view, $display, $options);     $this->valueTitle = t('Filter by alias');   }    public function buildOptionsForm(&$form, FormStateInterface $form_state) {     parent::buildOptionsForm($form, $form_state);     $this->view->initStyle();   }    function query() {     $this->ensureMyTable();     $field = $this->tableAlias."nid"; //table_alias.".nid";     $nids = $this->getNidsByAliasString($this->value);     if (!empty($nids)) {       $this->query->addWhere('AND', $this->options['group'], $field, $nids, 'IN');     }   }    function getNidsByAliasString($aliasString) {     $query = db_select('url_alias');     $query->condition('alias', '%'.$aliasString.'%', 'LIKE');     $result = $query       ->fields('url_alias')       ->execute();      $nids = array();     foreach ($result as $data) {       array_push($nids, end(explode("/",$data->source)));     }     return $nids;   }  } 

Am missing a step or naming the filter incorrectly?

Checking the logs, I am getting these errors:

Notice: Undefined index: field in DrupalviewsPluginViewsHandlerManager->getHandler()  Notice: Undefined index: table in DrupalviewsPluginViewsHandlerManager->getHandler()  Notice: Undefined index: id in DrupalviewsPluginViewsHandlerManager->getHandler()