Add de/serialization methods for collection caching

lib/classes/collection.php

@@ -236,6 +236,16 @@ EOT;
         return $collection;
     }
 
+    /**
+     * @var Application
+     */
+    protected $app;
+
+    /**
+     * @var databox
+     */
+    protected $databox;
+
     /**
      * @var CollectionReference
      */
@@ -261,21 +271,17 @@ EOT;
      */
     protected $labels = [];
 
-    /**
-     * @var databox
-     */
-    protected $databox;
-
     /**
      * @var int[]|string
      */
     protected $binary_logo;
 
     /**
-     * @var Application
+     * @param Application $app
+     * @param $baseId
+     * @param CollectionReference $reference
+     * @param array $row
      */
-    protected $app;
-
     public function __construct(Application $app, $baseId, CollectionReference $reference, array $row)
     {
         $this->app = $app;
@@ -295,6 +301,24 @@ EOT;
         ];
     }
 
+    public function __sleep()
+    {
+        return array(
+            'reference',
+            'name',
+            'preferences',
+            'pub_wm',
+            'labels',
+            'binary_logo'
+        );
+    }
+
+    public function hydrate(Application $app)
+    {
+        $this->app = $app;
+        $this->databox = $app->getApplicationBox()->get_databox($this->reference->getDataboxId());
+    }
+
     private function dispatch($eventName, CollectionEvent $event)
     {
         $this->app['dispatcher']->dispatch($eventName, $event);