Merge pull request #20 from tsanchev/master

add option for start position

Author: richardfan1126

README.md

@@ -35,6 +35,7 @@ public function actions(){
             'class' => SortableAction::className(),
             'activeRecordClassName' => YourActiveRecordClass::className(),
             'orderColumn' => 'name_of_field_storing_ordering',
+            'startPosition' => 1, // optional, default is 0
         ],
         // your other actions
     ];

SortableAction.php

@@ -7,6 +7,7 @@
 use yii\base\InvalidConfigException;
 
 class SortableAction extends Action {
+
     /**
      * (required) The ActiveRecord Class name
      *
@@ -21,6 +22,13 @@ class SortableAction extends Action {
      */
     public $orderColumn;
 
+    /**
+     * Start index/position default 0
+     *
+     * @var integer
+     */
+    public $startPosition = 0;
+
     public function init(){
         parent::init();
         if(!isset($this->activeRecordClassName)){
@@ -41,7 +49,7 @@ public function run(){
                 $page = $activeRecordClassName::findOne($item);
                 //$page = $activeRecordClassName::find()->where($item);
                 $page->updateAttributes([
-                    $this->orderColumn => $i,
+                    $this->orderColumn => $i + $this->startPosition,
                 ]);
             }
         }