Merge pull request #51 from BitBagCommerce/fix/op-311-fix-grid-sorting

OP-311/Fix grid sorting

Author: senghe

src/Resources/config/grids/bitbag_shipping_export.yml

@@ -17,7 +17,7 @@ sylius_grid:
                     type: twig
                     label: sylius.ui.order
                     path: .
-                    sortable: shipment.order
+                    sortable: shipment.order.number
                     options:
                         template: "@BitBagSyliusShippingExportPlugin/ShippingExport/Grid/Field/orderNumber.html.twig"
                 shipment:
@@ -38,7 +38,7 @@ sylius_grid:
                     type: twig
                     label: sylius.ui.shipping_method
                     path: .
-                    sortable: shipment.method
+                    sortable: shipment.method.code
                     options:
                         template: "@BitBagSyliusShippingExportPlugin/ShippingExport/Grid/Field/shippingMethod.html.twig"
                 labelPath: