fix #1, update readme and composer.

Bootstrap.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace mdm\autonumber;
+
+use yii\base\BootstrapInterface;
+use yii\validators\Validator;
+
+/**
+ * Description of Bootstrap
+ *
+ * @author Misbahul D Munir <misbahuldmunir@gmail.com>
+ * @since 1.0
+ */
+class Bootstrap implements BootstrapInterface
+{
+    /**
+     * @inheritdoc
+     */
+    public function bootstrap($app)
+    {
+        Validator::$builtInValidators['nextValue'] = __NAMESPACE__ . '\NextValueValidator';
+    }
+}

NextValueValidator.php

@@ -14,7 +14,7 @@
  * 
  * ~~~
  * return [
- *     [['sales_num'], 'mdm\autonumber\NextValueValidator', 'format'=>'SA.'.date('Ymd').'?'],
+ *     [['sales_num'], 'nextValue', 'format'=>'SA.'.date('Ymd').'?'],
  *     ...
  * ]
  * ~~~
@@ -97,7 +97,7 @@ public function nextValue($object, $attribute)
         $group = md5(serialize([
             'class' => $this->unique ? get_class($object) : false,
             'group' => $this->group,
-            'attribute' => $this->attribute,
+            'attribute' => $attribute,
             'value' => $value
         ]));
         $model = AutoNumber::findOne($group);
@@ -131,10 +131,10 @@ public function beforeSave($event)
     {
         /* @var $model AutoNumber */
         list($model, $id) = $event->data;
-        if (isset(static::$_executed[$id])) {
+        if (isset(self::$_executed[$id])) {
             return;
         }
-        static::$_executed[$id] = true;
+        self::$_executed[$id] = true;
         try {
             $model->save();
         } catch (\Exception $exc) {

README.md

@@ -70,7 +70,7 @@ Instead of behavior, you can use this extension as validator
 public function rules()
 {
     return [
-        [['sales_num'],'mdm\autonumber\NextValueValidator','format'=>'SA.'.date('Y-m-d').'.?'],
+        [['sales_num'],'nextValue','format'=>'SA.'.date('Y-m-d').'.?'],
         ...
     ];
 }

composer.json

@@ -20,8 +20,9 @@
         }
     },
     "extra": {
+        "bootstrap": "mdm\\autonumber\\Bootstrap",
         "branch-alias": {
-            "dev-master": "1.0.x-dev"
+            "dev-master": "1.x-dev"
         }
     }
 }