Computed fields cannot be sorts or filters

recurring_events.views.inc

@@ -38,18 +38,6 @@ function recurring_events_views_data_alter(array &$data) {
       'id' => 'eventinstance_title',
       'field_name' => 'title',
     ],
-    'filter' => [
-      'title' => t('Event instance title'),
-      'help' => t('The inherited title of an event instance.'),
-      'id' => 'eventinstance_title',
-      'field_name' => 'title',
-    ],
-    'sort' => [
-      'title' => t('Event instance title'),
-      'help' => t('The inherited title of an event instance.'),
-      'id' => 'eventinstance_title',
-      'field_name' => 'title',
-    ],
   ];
 
   // Create a field to show the inherited description of an event instance.
@@ -61,17 +49,5 @@ function recurring_events_views_data_alter(array &$data) {
       'id' => 'eventinstance_description',
       'field_name' => 'description',
     ],
-    'filter' => [
-      'title' => t('Event instance description'),
-      'help' => t('The inherited description of an event instance.'),
-      'id' => 'eventinstance_description',
-      'field_name' => 'description',
-    ],
-    'sort' => [
-      'title' => t('Event instance description'),
-      'help' => t('The inherited description of an event instance.'),
-      'id' => 'eventinstance_description',
-      'field_name' => 'description',
-    ],
   ];
 }

src/Plugin/views/filter/EventInstanceDescription.php

-<?php
-
-namespace Drupal\recurring_events\Plugin\views\filter;
-
-use Drupal\views\Plugin\views\filter\StringFilter;
-
-/**
- * Filter handler for the inherited event instance description.
- *
- * @ingroup views_filter_handlers
- *
- * @ViewsFilter("eventinstance_description")
- */
-class EventInstanceDescription extends StringFilter {
-
-}

src/Plugin/views/filter/EventInstanceTitle.php

-<?php
-
-namespace Drupal\recurring_events\Plugin\views\filter;
-
-use Drupal\views\Plugin\views\filter\StringFilter;
-
-/**
- * Filter handler for the inherited event instance title.
- *
- * @ingroup views_filter_handlers
- *
- * @ViewsFilter("eventinstance_title")
- */
-class EventInstanceTitle extends StringFilter {
-
-}

src/Plugin/views/sort/EventInstanceDescription.php

-<?php
-
-namespace Drupal\recurring_events\Plugin\views\sort;
-
-use Drupal\views\Plugin\views\sort\Standard;
-
-/**
- * Sort handler for the inherited event instance description.
- *
- * @ingroup views_filter_handlers
- *
- * @ViewsSort("eventinstance_description")
- */
-class EventInstanceDescription extends Standard {
-
-}

src/Plugin/views/sort/EventInstanceTitle.php

-<?php
-
-namespace Drupal\recurring_events\Plugin\views\sort;
-
-use Drupal\views\Plugin\views\sort\Standard;
-
-/**
- * Sort handler for the inherited event instance title.
- *
- * @ingroup views_filter_handlers
- *
- * @ViewsSort("eventinstance_title")
- */
-class EventInstanceTitle extends Standard {
-
-}