Issue #3325454 by josh.fabean: When Deleting a Opening Instance Directly...

use Drupal\Core\Field\BaseFieldDefinition;

use Drupal\Core\Field\FieldStorageDefinitionInterface;

use Drupal\bookable_calendar\DateFormatter;

use Drupal\Core\Database\Connection;

/**

 * Defines the bookable calendar opening instance entity class.

    parent::postSave($storage, $update);

  }

  /**

   * When an Instance is deleted remove it from the repeat rule on the parent opening

   *

   * {@inheritdoc}

   */

  public static function preDelete(EntityStorageInterface $storage, array $entities) {

    foreach ($entities as $entity) {

      $start_date = $entity->date->value;

      $end_date = $entity->date->end_value;

      $opening = $entity->booking_opening->entity;

      $database = \Drupal::database();

      // Find rrule instance we need to remove.

      $instance_to_delete = $database->select('bookable_calendar_opening__date', 'date')

      ->condition('date.entity_id', $opening->id())

      ->condition('date.date_value', $start_date)

      ->condition('date.date_end_value', $end_date)

      ->fields('date', [

        'entity_id',

        'date_value',

        'date_end_value',

        'date_rrule',

        'date_rrule_index'

      ])

      ->execute()->fetch();

      if (!is_null($instance_to_delete)) {

        // If we found an instance to delete, delete it.

        $database->delete('bookable_calendar_opening__date')

          ->condition('entity_id', $opening->id())

          ->condition('date_value', $start_date)

          ->condition('date_end_value', $end_date)

          ->execute();

        // Also add override so it doesn't come back.

        $smart_date_override_storage = \Drupal::entityTypeManager()->getStorage('smart_date_override');

        $new_smart_date = $smart_date_override_storage->create([

          'rrule' => $instance_to_delete->date_rrule,

          'rrule_index' => $instance_to_delete->date_rrule_index,

          'value' => null,

          'end_value' => null,

          'duration' => null

        ]);

        $new_smart_date->save();

      }

    }

  }

  /**

   * How many remaining slots are there.

   *