Added route and controller for editing hat

So that the person id is in the URL.

src/Controller/HatController.php

@@ -10,10 +10,10 @@ use Drupal\Core\Controller\ControllerBase;
 class HatController extends ControllerBase {
 
   /**
-   * Hello.
+   * Displays a form for creating a hat. 
+   * The type of hat and the person are prepopulated.
    *
-   * @return string
-   *   Return Hello string.
+   * @return form for creating a hat
    */
   public function createHatForPerson($person_id, $hat_type_id) {
     $values = array(
@@ -21,13 +21,34 @@ class HatController extends ControllerBase {
       'person' =>  $person_id
     );
 
-    $node = \Drupal::entityTypeManager()
+    $hat = \Drupal::entityTypeManager()
       ->getStorage('hat')
       ->create($values);
 
     $form = \Drupal::entityTypeManager()
       ->getFormObject('hat', 'default')
-      ->setEntity($node);
+      ->setEntity($hat);
+    return \Drupal::formBuilder()->getForm($form);
+  }
+
+  /**
+   * Displays a form for editing a hat. 
+   * The reason it is here is that the URL needs to have the person id in it  
+   * in order to filter the contact details entity reference view to only show ones for that person.
+   * (The intuitive way to bring this about - changing the edit route for the entity itself - causes problems with the delete route)
+   *
+   * @return form for editing a hat
+   */
+  public function editHatForPerson($person_id, $hat_id) {
+    error_log("hjhjhjhj");
+
+    $hat = \Drupal::entityTypeManager()
+      ->getStorage('hat')
+      ->load($hat_id);
+
+    $form = \Drupal::entityTypeManager()
+      ->getFormObject('hat', 'default')
+      ->setEntity($hat);
     return \Drupal::formBuilder()->getForm($form);
   }