fix: [individuals:delete] Gracefully catches deletion of individuals associated to a user

src/Controller/Component/CRUDComponent.php

@@ -851,6 +851,9 @@ class CRUDComponent extends Component
                     $query->contain($params['contain']);
                 }
                 $data = $query->first();
+                if (isset($params['afterFind'])) {
+                    $data = $params['afterFind']($data, $params);
+                }
                 if (empty($data)) {
                     throw new NotFoundException(__('Invalid {0}.', $this->ObjectAlias));
                 }
@@ -873,6 +876,9 @@ class CRUDComponent extends Component
                     $query->contain($params['contain']);
                 }
                 $data = $query->first();
+                if (isset($params['afterFind'])) {
+                    $data = $params['afterFind']($data, $params);
+                }
                 if (isset($params['beforeSave'])) {
                     try {
                         $data = $params['beforeSave']($data);

src/Controller/IndividualsController.php

@@ -94,7 +94,16 @@ class IndividualsController extends AppController
 
     public function delete($id)
     {
-        $this->CRUD->delete($id);
+        $params = [
+            'contain' => ['Users'],
+            'afterFind' => function($data, $params) {
+                if (!empty($data['user'])) {
+                    throw new ForbiddenException(__('Individual associated to a user cannot be deleted.'));
+                }
+                return $data;
+            }
+        ];
+        $this->CRUD->delete($id, $params);
         $responsePayload = $this->CRUD->getResponsePayload();
         if (!empty($responsePayload)) {
             return $responsePayload;

templates/Individuals/index.php

@@ -103,6 +103,9 @@ echo $this->element('genericElements/IndexTable/index_table', [
                 'icon' => 'trash',
                 'complex_requirement' => [
                     'function' => function ($row, $options) use ($loggedUser) {
+                        if (!empty($row['user'])) { // cannot delete individuals with associated user(s)
+                            return false;
+                        }
                         return (bool)$loggedUser['role']['perm_admin'];
                     }
                 ]