Added second class to debug 1:n relation, which is working in general

src/admin/common/models/factory/club.php

@@ -16,7 +16,7 @@ class CommonClubsModelFactoryClub extends AbstractCommonClubsModelFactory
             'iban'=>array(),
             'bic'=>array(),
             'charitable'=>array('type'=>'int'),
-            'president'=>array('type'=>'int', 'ref'=>'CommonClubsModelUser')
+            'president'=>array('type'=>'ref', 'ref'=>'CommonClubsModelUser')
         );
     }
 

src/admin/common/models/factory/user.php

@@ -0,0 +1,27 @@
+<?php
+
+// No direct access.
+defined('_JEXEC') or die;
+
+class CommonClubsModelFactoryUser extends AbstractCommonClubsModelFactory
+{
+    public function getAttributes()
+    {
+        return array(
+            'user'=>array(),
+            'name'=>array()
+        );
+    }
+
+    public function getTableName()
+    {
+        return '#__club_users';
+    }
+
+    public function getClassName()
+    {
+        return 'CommonClubsModelUser';
+    }
+
+    
+}