Check that type of alert field exists before using as a sort for curr…

…ent banners

During import, and in times where the type_of_alert field has been deleted, the
getCurrentBanners method will try to perform an entity query, but it needs to
check the field is present before adding a sort.

src/Plugin/Block/AlertBannerBlock.php

@@ -7,6 +7,7 @@
 use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\field\Entity\FieldStorageConfig;
 use Drupal\Core\Session\AccountProxyInterface;
 use Drupal\Core\Block\BlockBase;
 
@@ -168,14 +169,26 @@ protected function getCurrentAlertBanners() {
     $types = $this->mapTypesConfigToQuery();
     $published_alert_banner_query = $this->entityTypeManager->getStorage('localgov_alert_banner')
       ->getQuery()
-      ->condition('status', 1)
-      ->sort('type_of_alert', 'DESC')
-      ->sort('changed', 'DESC')
+      ->condition('status', 1);
+
+    // Only order by type of alert if the field is present.
+    $alert_banner_has_type_of_alert = FieldStorageConfig::loadByName('localgov_alert_banner', 'type_of_alert');
+    if (!empty($alert_banner_has_type_of_alert)) {
+      $published_alert_banner_query->sort('type_of_alert', 'DESC');
+    }
+
+    // Continue alert banner query.
+    $published_alert_banner_query->sort('changed', 'DESC')
       ->accessCheck(TRUE);
+
+    // If types (bunldes) are selected, add filter condition.
     if (!empty($types)) {
       $published_alert_banner_query->condition('type', $types, 'IN');
     }
+
+    // Execute alert banner query.
     $published_alert_banners = $published_alert_banner_query->execute();
+
     // Load alert banners and add all.
     // Visibility check happens in build, so we get cache contexts on all.
     foreach ($published_alert_banners as $alert_banner_id) {

tests/src/Kernel/AlertBannerBlockOrderTest.php

@@ -160,4 +160,59 @@ public function testAlertBannerBlockOrder() {
 
   }
 
+  /**
+   * Test alert banner block order without type of alert.
+   */
+  public function testAlertBannerBlockOrderWithoutTypeOfAlert() {
+
+    // Delete type of alert field.
+    // This is so we are testing the case where :-
+    // - Alerts don't have a type, so are in date order.
+    // - Querying for current banners without the type field is possible.
+    $this->container
+      ->get('entity_type.manager')
+      ->getStorage('field_storage_config')
+      ->load('localgov_alert_banner.type_of_alert')
+      ->delete();
+
+    // Alert times.
+    $alert_times = [
+      (new DrupalDateTime('-4 hours'))->getTimestamp(),
+      (new DrupalDateTime('-2 hours'))->getTimestamp(),
+      (new DrupalDateTime('-3 hours'))->getTimestamp(),
+      (new DrupalDateTime('now'))->getTimestamp(),
+    ];
+
+    // Set up alert banners.
+    foreach ($alert_times as $changed) {
+      $alert_entity = $this->container->get('entity_type.manager')->getStorage('localgov_alert_banner')
+        ->create([
+          'type' => 'localgov_alert_banner',
+          'title' => $this->randomMachineName(8),
+          'moderation_state' => 'published',
+          'changed' => $changed,
+        ]);
+      $alert_entity->save();
+      $alert[] = $alert_entity->id();
+    }
+
+    // Create and render the block and get the alert banner IDs as an array.
+    $block_manager = $this->container->get('plugin.manager.block');
+    $config = [];
+    $plugin_block = $block_manager->createInstance('localgov_alert_banner_block', $config);
+    $render = $plugin_block->build();
+    foreach ($render as $render_value) {
+      $result[] = $render_value['#localgov_alert_banner']->id();
+    }
+
+    // Set expected order, which will be date changed order.
+    $expected = [
+      $alert[3],
+      $alert[1],
+      $alert[2],
+      $alert[0],
+    ];
+    $this->assertEquals($expected, $result);
+  }
+
 }