Added custom field formatter to exclude current organisation from entity reference list

src/Plugin/Field/FieldFormatter/EntityReferenceCurrentTargetExcluder.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace Drupal\opencase\Plugin\Field\FieldFormatter;
+
+use Drupal\Core\Field\Plugin\Field\FieldFormatter\EntityReferenceLabelFormatter;
+
+/**
+ * Plugin implementation of the 'entity reference label delta' formatter.
+ *
+ * @FieldFormatter(
+ *   id = "entity_reference_current_target_excluder",
+ *   label = @Translation("Exclude current entity from list (ONLY WORKS WITH ORGS FOR NOW)"),
+ *   description = @Translation("Don't show the referenced entity if it is the entity being currently viewed"),
+ *   field_types = {
+ *     "entity_reference"
+ *   }
+ * )
+ */
+class EntityReferenceCurrentTargetExcluder extends EntityReferenceLabelFormatter {
+
+  // Remove the item which matches the organisation being currently viewed. 
+  public function viewElements(\Drupal\Core\Field\FieldItemListInterface $items, $langcode) {
+    foreach($items as $delta=>$item) {
+      $current_org = \Drupal::routeMatch()->getParameter('oc_organisation')->id();
+      $item_target_id = $item->get('target_id')->getValue();
+      \Drupal::logger("foo")->error($current_org . " " . $item_target_id);
+      if ($current_org == $item_target_id) {
+        $items->removeItem($delta);
+        break;
+      }
+    }
+    $elements = parent::viewElements($items, $langcode);
+    return $elements;
+  }
+  //
+}