fix updating bachelor via admin

registration-system/admin/pages_list.php

@@ -7,9 +7,12 @@ class AdminListPage extends AdminPage {
 
         if (isset($_REQUEST['change'])) {
             try {
-                $b = Bachelor::makeFromForm(false, $this->fahrt, true, true);
-                $b->set(['bachelor_id' => $_REQUEST['change']]);
-                $saveResult = $b->save();
+                $bNew = Bachelor::makeFromForm(false, $this->fahrt, true, true);
+                $bNew->set(['bachelor_id' => $_REQUEST['change']]);
+
+                $bOld = Bachelor::makeFromDB($this->fahrt, $_REQUEST['change']);
+                $bOld->updateBachelor($bNew);
+                $saveResult = $bOld->save();
                 if ($saveResult !== Bachelor::SAVE_SUCCESS)
                     throw new Exception('Fehler beim Speichern mit code ' . $saveResult.'<br />'.implode('<br />', $b->getValidationErrors()));
                 else

registration-system/frameworks/Bachelor.php

@@ -459,4 +459,15 @@ class Bachelor {
         }
 
     }
+
+    /**
+     * @param $newBachelor Bachelor
+     */
+    public function updateBachelor($newBachelor) {
+        $nBdata = $newBachelor->getData();
+        foreach ($this->data as $key => $val) {
+            if (isset($nBdata[$key]) and !empty($nBdata[$key]))
+                $this->data[$key] = $nBdata[$key];
+        }
+    }
 }
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