chore: Improve mock data handling

src/GraphQL/FieldHelper/DataObjectFieldHelper.php

@@ -400,15 +400,46 @@ public function doExtractData(FieldNode $ast, &$data, $container, $args, $contex
             // in this case we just try to get the data directly
             if ($container instanceof DefaultMockup) {
                 try {
-                    // we don't have to take care about localization because this is already handled in elastic
-                    $data[$astName] = $container->$getter();
+                    $this->setValueFromMockObject($data, $container, $astName);
                 } catch (\Exception $e) {
                     Logger::info('Could not get data from Datahub/DataObjectFieldHelper with message: ' . $e->getMessage());
                 }
             }
         }
     }
 
+    /**
+     * Try to get the data from the mock object.
+     *
+     * Elastic values are already language specific so no locale handling.
+     *
+     * Because the DefaultMockup class doesn't provide APIs to check if data
+     * exist we've to load all the things and essentially rebuild how
+     * \Pimcore\Bundle\EcommerceFrameworkBundle\Model\DefaultMockup::__call()
+     * works.
+     *
+     * @param $data
+     * @param \Pimcore\Bundle\EcommerceFrameworkBundle\Model\DefaultMockup $container
+     * @param $astName
+     *
+     * @return mixed|void
+     */
+    protected function setValueFromMockObject(&$data, DefaultMockup $container, $astName)
+    {
+        $params = $container->getParams();
+        if (is_array($params) && array_key_exists($astName, $params)) {
+            $data[$astName] = $params[$astName];
+        } else {
+            $relations = $container->getRelations();
+            if (is_array($relations) && array_key_exists($astName, $relations)) {
+                $relation = $container->getRelationAttribute($astName);
+                if ($relation) {
+                    $data[$astName] = $relation;
+                }
+            }
+        }
+    }
+
     /**
      * @param object $container
      * @param string $astName