Added possibillity to delete attachments in admin page.

src/Services/EntityURLGenerator.php

@@ -73,6 +73,8 @@ class EntityURLGenerator
             case 'list':
             case 'list_parts':
                 return $this->listPartsURL($entity);
+            case 'delete':
+                return $this->deleteURL($entity);
         }
 
         throw new \InvalidArgumentException('Method is not supported!');
@@ -169,6 +171,15 @@ class EntityURLGenerator
 
     }
 
+    public function deleteURL($entity) : string
+    {
+        if($entity instanceof AttachmentType) {
+            return $this->urlGenerator->generate('attachment_type_delete', ['id' => $entity->getID()]);
+        }
+
+        throw new EntityNotSupported('The given entity is not supported yet!');
+    }
+
     /**
      * Generates an HTML link to the info page about the given entity.
      *