Update 4.2 branch to php 7 and replace sortablegridfield with gridfie…

…ldextensions

README.md

@@ -87,7 +87,7 @@ CatalogPage:
 
 #### Drag and drop sorting
 
-You can add drag and drop sorting using GridFieldSortableRows when you add the `sort_column` setting to your configuration.
+You can add drag and drop sorting using GridFieldOrderableRows when you add the `sort_column` setting to your configuration.
 Uses column `Sort` by default which is default in SiteTree and is added by CatalogDataObjectExtension.
 
 ```yml

code/ModelAdmin/CatalogPageAdmin.php

@@ -25,6 +25,7 @@ public function init()
      */
     public function getEditForm($id = null, $fields = null)
     {
+        /** @var DataObject|CatalogPageExtension|CatalogDataObjectExtension $model */
         $model = singleton($this->modelClass);
         if ($model->has_extension('CatalogPageExtension') || $model->has_extension('CatalogDataObjectExtension')) {
             $list = $this->getList()->setDataQueryParam(array(
@@ -66,8 +67,8 @@ public function getEditForm($id = null, $fields = null)
             $form->setAttribute('data-pjax-fragment', 'CurrentForm');
 
             /** add sorting if we have a field for... */
-            if (class_exists('GridFieldSortableRows') && $sortField = $model->getSortFieldname()) {
-                $fieldConfig->addComponent(new GridFieldSortableRows($sortField));
+            if ($sortField = $model->getSortFieldname()) {
+                $fieldConfig->addComponent(new GridFieldOrderableRows($sortField));
             }
         } elseif (method_exists($model, 'getAdminListField')) {
             $form = CMSForm::create(

composer.json

@@ -21,9 +21,9 @@
         }
     ],
     "require": {
-        "undefinedoffset/sortablegridfield": "^0.6.0",
+        "php": "^7",
+        "symbiote/silverstripe-gridfieldextensions": "^2",
         "silverstripe/cms": "^3.4",
         "unclecheese/betterbuttons": "^1.3.7"
-
     }
 }