wooops, that was missing.

src/Sylius/Bundle/SalesBundle/Filtering/FilterInterface.php

@@ -0,0 +1,22 @@
+<?php
+
+/*
+ * This file is part of the Sylius package.
+ *
+ * (c) Paweł Jędrzejewski
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Sylius\Bundle\SalesBundle\Filtering;
+
+/**
+ * Interface for filter.
+ *
+ * @author Paweł Jędrzejewski <pjedrzejewski@diweb.pl>
+ */
+interface FilterInterface
+{
+    function filter($filterable);
+}

src/Sylius/Bundle/SalesBundle/Filtering/ORM/OrderFilter.php

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+<?php
+
+/*
+ * This file is part of the Sylius package.
+ *
+ * (c) Paweł Jędrzejewski
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Sylius\Bundle\SalesBundle\Filtering\ORM;
+
+use Symfony\Component\DependencyInjection\ContainerAware;
+use Doctrine\ORM\QueryBuilder;
+use Sylius\Bundle\SalesBundle\Filtering\FilterInterface;
+
+/**
+ * Default ORM filter.
+ * Filters order entities.
+ *
+ * @author Paweł Jędrzejewski <pjedrzejewski@diweb.pl>
+ */
+class OrderFilter extends ContainerAware implements FilterInterface
+{
+    public function filter($filterable)
+    {
+        if (!$filterable instanceof QueryBuilder) {
+            throw new InvalidArgumentException('Default filter supports only "Doctrine\\ORM\\QueryBuilder" as argument.');
+        }
+        
+        $request = $this->container->get('request');
+        $filters = $filters = $request->query->get('filters');
+        if (null == $filters || !is_array($filters)) {
+            
+            return;
+        }
+        
+        $orderClass = $this->container->getParameter('sylius_sales.model.order.class');
+        $reflectionClass = new \ReflectionClass($orderClass);
+        $properties = array_keys($reflectionClass->getDefaultProperties());
+
+        $i = 0;
+        foreach ($filters as $property => $filter) {
+            if (in_array($property, $properties) && in_array($filter[1], array('>', '<', '=', '>=', '<='))) {
+                /** @var QueryBuilder */
+                $filterable
+                    ->andWhere('o.'.$property . ' ' . $filter[1] . ' :PARAM' . $i)
+                    ->setParameter('PARAM' . $i, $filter[0])
+                ;
+                
+                $i++;
+            }
+        }
+    }
+}