Refactor

modules/opencase_cases/src/Entity/OCCase.php

@@ -92,11 +92,21 @@ class OCCase extends RevisionableContentEntityBase implements OCCaseInterface
   }
 
   public function deleteCaseProvisions(): void {
-    $query = \Drupal::entityQuery('oc_case_provision')
+    $this->deleteChildren('oc_case_provision');
+  }
+  public function deleteActivities(): void {
+    $this->deleteChildren('oc_activity');
+  }
+
+
+  public function deleteChildren($child_entity_type):void {
+    $query = \Drupal::entityQuery($child_entity_type)
       ->condition('oc_case.target_id', $this->id());
     $ids =  $query->execute();
     foreach($ids as $id) {
-      OCcaseProvision::load($id)->delete();
+      \Drupal::entityTypeManager()
+        ->getStorage($child_entity_type)
+        ->load($id)->delete();
     }
   }