From 51a442d6c8266bf14e258cc77625b6d192f678d0 Mon Sep 17 00:00:00 2001
From: Klimov Paul <klimov.paul@gmail.com>
Date: Tue, 26 May 2015 11:53:34 +0300
Subject: [PATCH 1/4] Fixed `yii\db\ActiveRecord` does not updates attribute
 specified at `optimisticLock()` after save

---
 framework/CHANGELOG.md                  |  1 +
 framework/db/BaseActiveRecord.php       |  3 +++
 tests/data/ar/Document.php              | 17 +++++++++++++++++
 tests/data/cubrid.sql                   | 11 +++++++++++
 tests/data/mssql.sql                    | 13 +++++++++++++
 tests/data/mysql.sql                    | 11 +++++++++++
 tests/data/oci.sql                      | 13 +++++++++++++
 tests/data/postgres.sql                 | 11 ++++++++++-
 tests/data/sqlite.sql                   | 11 +++++++++++
 tests/framework/db/ActiveRecordTest.php | 17 +++++++++++++++++
 10 files changed, 107 insertions(+), 1 deletion(-)
 create mode 100644 tests/data/ar/Document.php

diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index 6055f546cf..1fa0896147 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -11,6 +11,7 @@ Yii Framework 2 Change Log
 - Bug #8451: `yii\i18n\Formatter` did not allow negative unix timestamps as input for date formatting (cebe)
 - Bug #8483: sequence name in `Schema::getLastInsertId()` was not properly quoted (nineinchnick)
 - Bug #8506: Cleaning of output buffer in `Widget::run()` conflicts with `Pjax` widget which did the cleanup itself (cebe, joester89)
+- Bug #8544: Fixed `yii\db\ActiveRecord` does not updates attribute specified at `optimisticLock()` after save (klimov-paul)
 - Bug: Fixed string comparison in `BaseActiveRecord::unlink()` which may result in wrong comparison result for hash valued primary keys starting with `0e` (cebe)
 - Enh #7169: `yii\widgets\ActiveField` now uses corresponding methods for default parts rendering (klimov-paul)
 - Enh #8070: `yii\console\controllers\MessageController` now sorts created messages, even if there is no new one, while saving to PHP file (klimov-paul)
diff --git a/framework/db/BaseActiveRecord.php b/framework/db/BaseActiveRecord.php
index d99192a05e..a479819d9b 100644
--- a/framework/db/BaseActiveRecord.php
+++ b/framework/db/BaseActiveRecord.php
@@ -725,6 +725,9 @@ abstract class BaseActiveRecord extends Model implements ActiveRecordInterface
         foreach ($values as $name => $value) {
             $changedAttributes[$name] = isset($this->_oldAttributes[$name]) ? $this->_oldAttributes[$name] : null;
             $this->_oldAttributes[$name] = $value;
+            if ($name === $lock) {
+                $this->$lock = $value;
+            }
         }
         $this->afterSave(false, $changedAttributes);
 
diff --git a/tests/data/ar/Document.php b/tests/data/ar/Document.php
new file mode 100644
index 0000000000..e4b7bc857a
--- /dev/null
+++ b/tests/data/ar/Document.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace yiiunit\data\ar;
+
+/**
+ * @property integer $id
+ * @property string $title
+ * @property string $content
+ * @property integer $version
+ */
+class Document extends ActiveRecord
+{
+    public function optimisticLock()
+    {
+        return 'version';
+    }
+}
\ No newline at end of file
diff --git a/tests/data/cubrid.sql b/tests/data/cubrid.sql
index 5c87d75a98..d98af69ae7 100644
--- a/tests/data/cubrid.sql
+++ b/tests/data/cubrid.sql
@@ -17,6 +17,7 @@ DROP TABLE IF EXISTS "type";
 DROP TABLE IF EXISTS "constraints";
 DROP TABLE IF EXISTS "animal";
 DROP TABLE IF EXISTS "default_pk";
+DROP TABLE IF EXISTS "document";
 DROP VIEW IF EXISTS "animal_view";
 
 CREATE TABLE "constraints"
@@ -139,6 +140,14 @@ CREATE TABLE "default_pk" (
   PRIMARY KEY ("id")
 );
 
+CREATE TABLE "document" (
+  "id" int(11) NOT NULL AUTO_INCREMENT,
+  "title" varchar(255) NOT NULL,
+  "content" string,
+  "version" int(11) NOT NULL DEFAULT 0,
+  PRIMARY KEY ("id")
+);
+
 CREATE VIEW "animal_view" AS SELECT * FROM "animal";
 
 INSERT INTO "animal" ("type") VALUES ('yiiunit\data\ar\Cat');
@@ -181,3 +190,5 @@ INSERT INTO "order_item_with_null_fk" (order_id, item_id, quantity, subtotal) VA
 INSERT INTO "order_item_with_null_fk" (order_id, item_id, quantity, subtotal) VALUES (2, 5, 1, 15.0);
 INSERT INTO "order_item_with_null_fk" (order_id, item_id, quantity, subtotal) VALUES (2, 3, 1, 8.0);
 INSERT INTO "order_item_with_null_fk" (order_id, item_id, quantity, subtotal) VALUES (3, 2, 1, 40.0);
+
+INSERT INTO "document" (title, content, version) VALUES ('Yii 2.0 guide', 'This is Yii 2.0 guide', 0);
diff --git a/tests/data/mssql.sql b/tests/data/mssql.sql
index 488dbd6e7e..344b39573b 100644
--- a/tests/data/mssql.sql
+++ b/tests/data/mssql.sql
@@ -10,6 +10,7 @@ IF OBJECT_ID('[dbo].[type]', 'U') IS NOT NULL DROP TABLE [dbo].[type];
 IF OBJECT_ID('[dbo].[null_values]', 'U') IS NOT NULL DROP TABLE [dbo].[null_values];
 IF OBJECT_ID('[dbo].[animal]', 'U') IS NOT NULL DROP TABLE [dbo].[animal];
 IF OBJECT_ID('[dbo].[default_pk]', 'U') IS NOT NULL DROP TABLE [dbo].[default_pk];
+IF OBJECT_ID('[dbo].[document]', 'U') IS NOT NULL DROP TABLE [dbo].[document];
 IF OBJECT_ID('[dbo].[animal_view]', 'V') IS NOT NULL DROP VIEW [dbo].[animal_view];
 
 CREATE TABLE [dbo].[profile] (
@@ -124,6 +125,16 @@ CREATE TABLE [dbo].[default_pk] (
 	) ON [PRIMARY]
 );
 
+CREATE TABLE [dbo].[document] (
+	[id] [int] IDENTITY(1,1) NOT NULL,
+	[title] [varchar](255) NOT NULL,
+	[content] [text],
+	[version] [int] NOT NULL DEFAULT 0,
+	CONSTRAINT [PK_default_pk] PRIMARY KEY CLUSTERED (
+		[id] ASC
+	) ON [PRIMARY]
+);
+
 CREATE VIEW [dbo].[animal_view] AS SELECT * FROM [dbo].[animal];
 
 INSERT INTO [dbo].[animal] (type) VALUES ('yiiunit\data\ar\Cat');
@@ -166,3 +177,5 @@ INSERT INTO [dbo].[order_item_with_null_fk] ([order_id], [item_id], [quantity],
 INSERT INTO [dbo].[order_item_with_null_fk] ([order_id], [item_id], [quantity], [subtotal]) VALUES (2, 5, 1, 15.0);
 INSERT INTO [dbo].[order_item_with_null_fk] ([order_id], [item_id], [quantity], [subtotal]) VALUES (2, 3, 1, 8.0);
 INSERT INTO [dbo].[order_item_with_null_fk] ([order_id], [item_id], [quantity], [subtotal]) VALUES (3, 2, 1, 40.0);
+
+INSERT INTO [dbo].[document] ([title], [content], [version]) VALUES ('Yii 2.0 guide', 'This is Yii 2.0 guide', 0);
diff --git a/tests/data/mysql.sql b/tests/data/mysql.sql
index 2dd1cb2206..f8414b6921 100644
--- a/tests/data/mysql.sql
+++ b/tests/data/mysql.sql
@@ -17,6 +17,7 @@ DROP TABLE IF EXISTS `type` CASCADE;
 DROP TABLE IF EXISTS `constraints` CASCADE;
 DROP TABLE IF EXISTS `animal` CASCADE;
 DROP TABLE IF EXISTS `default_pk` CASCADE;
+DROP TABLE IF EXISTS `document` CASCADE;
 DROP VIEW IF EXISTS `animal_view`;
 
 CREATE TABLE `constraints`
@@ -141,6 +142,14 @@ CREATE TABLE `default_pk` (
   PRIMARY KEY (id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
+CREATE TABLE `document` (
+  `id` INT(11) NOT NULL AUTO_INCREMENT,
+  `title` VARCHAR(255) NOT NULL,
+  `content` TEXT,
+  `version` INT(11) NOT NULL DEFAULT 0,
+  PRIMARY KEY (id)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+
 CREATE VIEW `animal_view` AS SELECT * FROM `animal`;
 
 INSERT INTO `animal` (`type`) VALUES ('yiiunit\data\ar\Cat');
@@ -184,6 +193,8 @@ INSERT INTO `order_item_with_null_fk` (order_id, item_id, quantity, subtotal) VA
 INSERT INTO `order_item_with_null_fk` (order_id, item_id, quantity, subtotal) VALUES (2, 3, 1, 8.0);
 INSERT INTO `order_item_with_null_fk` (order_id, item_id, quantity, subtotal) VALUES (3, 2, 1, 40.0);
 
+INSERT INTO `document` (title, content, version) VALUES ('Yii 2.0 guide', 'This is Yii 2.0 guide', 0);
+
 
 /**
  * (MySQL-)Database Schema for validator tests
diff --git a/tests/data/oci.sql b/tests/data/oci.sql
index c3d571fb59..90e0e897cf 100644
--- a/tests/data/oci.sql
+++ b/tests/data/oci.sql
@@ -19,6 +19,7 @@ BEGIN EXECUTE IMMEDIATE 'DROP TABLE "constraints"'; EXCEPTION WHEN OTHERS THEN I
 BEGIN EXECUTE IMMEDIATE 'DROP TABLE "bool_values"'; EXCEPTION WHEN OTHERS THEN IF SQLCODE != -942 THEN RAISE; END IF; END;--
 BEGIN EXECUTE IMMEDIATE 'DROP TABLE "animal"'; EXCEPTION WHEN OTHERS THEN IF SQLCODE != -942 THEN RAISE; END IF; END;--
 BEGIN EXECUTE IMMEDIATE 'DROP TABLE "default_pk"'; EXCEPTION WHEN OTHERS THEN IF SQLCODE != -942 THEN RAISE; END IF; END;--
+BEGIN EXECUTE IMMEDIATE 'DROP TABLE "document"'; EXCEPTION WHEN OTHERS THEN IF SQLCODE != -942 THEN RAISE; END IF; END;--
 BEGIN EXECUTE IMMEDIATE 'DROP VIEW "animal_view"'; EXCEPTION WHEN OTHERS THEN IF SQLCODE != -942 THEN RAISE; END IF; END;--
 BEGIN EXECUTE IMMEDIATE 'DROP TABLE "validator_main"'; EXCEPTION WHEN OTHERS THEN IF SQLCODE != -942 THEN RAISE; END IF; END;--
 BEGIN EXECUTE IMMEDIATE 'DROP TABLE "validator_ref"'; EXCEPTION WHEN OTHERS THEN IF SQLCODE != -942 THEN RAISE; END IF; END;--
@@ -32,6 +33,7 @@ BEGIN EXECUTE IMMEDIATE 'DROP SEQUENCE "order_with_null_fk_SEQ"'; EXCEPTION WHEN
 BEGIN EXECUTE IMMEDIATE 'DROP SEQUENCE "null_values_SEQ"'; EXCEPTION WHEN OTHERS THEN IF SQLCODE != -2289 THEN RAISE; END IF; END;--
 BEGIN EXECUTE IMMEDIATE 'DROP SEQUENCE "bool_values_SEQ"'; EXCEPTION WHEN OTHERS THEN IF SQLCODE != -2289 THEN RAISE; END IF; END;--
 BEGIN EXECUTE IMMEDIATE 'DROP SEQUENCE "animal_SEQ"'; EXCEPTION WHEN OTHERS THEN IF SQLCODE != -2289 THEN RAISE; END IF; END;--
+BEGIN EXECUTE IMMEDIATE 'DROP SEQUENCE "document_SEQ"'; EXCEPTION WHEN OTHERS THEN IF SQLCODE != -2289 THEN RAISE; END IF; END;--
 
 /* STATEMENTS */
 
@@ -171,6 +173,15 @@ CREATE TABLE "default_pk" (
   CONSTRAINT "default_pk_PK" PRIMARY KEY ("id") ENABLE
 );
 
+CREATE TABLE "document" (
+  "id" integer,
+  "title" varchar2(255) not null,
+  "content" varchar(4000),
+  "version" integer default 0 not null,
+  CONSTRAINT "document_PK" PRIMARY KEY ("id") ENABLE
+);
+CREATE SEQUENCE "document_SEQ";
+
 CREATE VIEW "animal_view" AS SELECT * FROM "animal";
 
 /**
@@ -282,6 +293,8 @@ INSERT INTO "order_item_with_null_fk" ("order_id", "item_id", "quantity", "subto
 INSERT INTO "order_item_with_null_fk" ("order_id", "item_id", "quantity", "subtotal") VALUES (2, 3, 1, 8.0);
 INSERT INTO "order_item_with_null_fk" ("order_id", "item_id", "quantity", "subtotal") VALUES (3, 2, 1, 40.0);
 
+INSERT INTO "document" ("title", "content", "version") VALUES ('Yii 2.0 guide', 'This is Yii 2.0 guide', 0);
+
 INSERT INTO "validator_main" ("id", "field1") VALUES (1, 'just a string1');
 INSERT INTO "validator_main" ("id", "field1") VALUES (2, 'just a string2');
 INSERT INTO "validator_main" ("id", "field1") VALUES (3, 'just a string3');
diff --git a/tests/data/postgres.sql b/tests/data/postgres.sql
index feceea4cc6..3c813b0602 100644
--- a/tests/data/postgres.sql
+++ b/tests/data/postgres.sql
@@ -19,6 +19,7 @@ DROP TABLE IF EXISTS "constraints" CASCADE;
 DROP TABLE IF EXISTS "bool_values" CASCADE;
 DROP TABLE IF EXISTS "animal" CASCADE;
 DROP TABLE IF EXISTS "default_pk" CASCADE;
+DROP TABLE IF EXISTS "document" CASCADE;
 DROP VIEW IF EXISTS "animal_view";
 DROP SCHEMA IF EXISTS "schema1" CASCADE;
 DROP SCHEMA IF EXISTS "schema2" CASCADE;
@@ -136,7 +137,6 @@ CREATE TABLE "bool_values" (
   default_false boolean not null default false
 );
 
-
 CREATE TABLE "animal" (
   id serial primary key,
   type varchar(255) not null
@@ -147,6 +147,13 @@ CREATE TABLE "default_pk" (
   type varchar(255) not null
 );
 
+CREATE TABLE "animal" (
+  id serial primary key,
+  title varchar(255) not null,
+  content text not null,
+  version integer not null default 0
+);
+
 CREATE VIEW "animal_view" AS SELECT * FROM "animal";
 
 INSERT INTO "animal" (type) VALUES ('yiiunit\data\ar\Cat');
@@ -194,6 +201,8 @@ INSERT INTO "order_item_with_null_fk" (order_id, item_id, quantity, subtotal) VA
 INSERT INTO "order_item_with_null_fk" (order_id, item_id, quantity, subtotal) VALUES (2, 3, 1, 8.0);
 INSERT INTO "order_item_with_null_fk" (order_id, item_id, quantity, subtotal) VALUES (3, 2, 1, 40.0);
 
+INSERT INTO "document" (title, content, version) VALUES ('Yii 2.0 guide', 'This is Yii 2.0 guide', 0);
+
 /**
  * (Postgres-)Database Schema for validator tests
  */
diff --git a/tests/data/sqlite.sql b/tests/data/sqlite.sql
index a0349a4b69..198d10f793 100644
--- a/tests/data/sqlite.sql
+++ b/tests/data/sqlite.sql
@@ -16,6 +16,7 @@ DROP TABLE IF EXISTS "type";
 DROP TABLE IF EXISTS "null_values";
 DROP TABLE IF EXISTS "animal";
 DROP TABLE IF EXISTS "default_pk";
+DROP TABLE IF EXISTS "document";
 DROP VIEW IF EXISTS "animal_view";
 
 CREATE TABLE "profile" (
@@ -123,6 +124,14 @@ CREATE TABLE "default_pk" (
   PRIMARY KEY (id)
 );
 
+CREATE TABLE "document" (
+  id INTEGER NOT NULL,
+  title VARCHAR(255) NOT NULL,
+  content text,
+  version INTEGER NOT NULL DEFAULT '0',
+  PRIMARY KEY (id)
+);
+
 CREATE VIEW "animal_view" AS SELECT * FROM "animal";
 
 INSERT INTO "animal" ("type") VALUES ('yiiunit\data\ar\Cat');
@@ -166,6 +175,8 @@ INSERT INTO "order_item_with_null_fk" (order_id, item_id, quantity, subtotal) VA
 INSERT INTO "order_item_with_null_fk" (order_id, item_id, quantity, subtotal) VALUES (2, 3, 1, 8.0);
 INSERT INTO "order_item_with_null_fk" (order_id, item_id, quantity, subtotal) VALUES (3, 2, 1, 40.0);
 
+INSERT INTO "document" (title, content, version) VALUES ('Yii 2.0 guide', 'This is Yii 2.0 guide', 0);
+
 /**
  * (SqLite-)Database Schema for validator tests
  */
diff --git a/tests/framework/db/ActiveRecordTest.php b/tests/framework/db/ActiveRecordTest.php
index bb0a61eace..5ee66a1643 100644
--- a/tests/framework/db/ActiveRecordTest.php
+++ b/tests/framework/db/ActiveRecordTest.php
@@ -4,6 +4,7 @@ namespace yiiunit\framework\db;
 use yiiunit\data\ar\ActiveRecord;
 use yiiunit\data\ar\Category;
 use yiiunit\data\ar\Customer;
+use yiiunit\data\ar\Document;
 use yiiunit\data\ar\NullValues;
 use yiiunit\data\ar\OrderItem;
 use yiiunit\data\ar\Order;
@@ -706,4 +707,20 @@ class ActiveRecordTest extends DatabaseTestCase
         $this->assertTrue($record->save(false));
         $this->assertEquals(1, $record->id);
     }
+
+    public function testOptimisticLock()
+    {
+        /* @var $record Document */
+
+        $record = Document::findOne(1);
+        $record->content = 'New Content';
+        $record->save(false);
+        $this->assertEquals(1, $record->version);
+
+        $record = Document::findOne(1);
+        $record->content = 'Rewrite attempt content';
+        $record->version = 0;
+        $this->setExpectedException('yii\db\StaleObjectException');
+        $record->save(false);
+    }
 }

From 467596633d3b3dd271d0213fbbffba41e3293982 Mon Sep 17 00:00:00 2001
From: Klimov Paul <klimov.paul@gmail.com>
Date: Tue, 26 May 2015 12:00:28 +0300
Subject: [PATCH 2/4] Code optimization

---
 framework/db/BaseActiveRecord.php | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/framework/db/BaseActiveRecord.php b/framework/db/BaseActiveRecord.php
index a479819d9b..a99fdd510d 100644
--- a/framework/db/BaseActiveRecord.php
+++ b/framework/db/BaseActiveRecord.php
@@ -721,13 +721,14 @@ abstract class BaseActiveRecord extends Model implements ActiveRecordInterface
             throw new StaleObjectException('The object being updated is outdated.');
         }
 
+        if (isset($values[$lock])) {
+            $this->$lock = $values[$lock];
+        }
+
         $changedAttributes = [];
         foreach ($values as $name => $value) {
             $changedAttributes[$name] = isset($this->_oldAttributes[$name]) ? $this->_oldAttributes[$name] : null;
             $this->_oldAttributes[$name] = $value;
-            if ($name === $lock) {
-                $this->$lock = $value;
-            }
         }
         $this->afterSave(false, $changedAttributes);
 

From 1fbe575feff28fd5b611b30eb5784de3024e8233 Mon Sep 17 00:00:00 2001
From: Nobuo Kihara <softark@gmail.com>
Date: Tue, 26 May 2015 18:50:07 +0900
Subject: [PATCH 3/4] docs/internals-ja updated [ci skip]

---
 docs/internals-ja/design-decisions.md     | 2 +-
 docs/internals-ja/translation-workflow.md | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/docs/internals-ja/design-decisions.md b/docs/internals-ja/design-decisions.md
index 862eb9afdb..90b95faa98 100644
--- a/docs/internals-ja/design-decisions.md
+++ b/docs/internals-ja/design-decisions.md
@@ -15,7 +15,7 @@
 3. **[認証クライアントのサポートの追加](https://github.com/yiisoft/yii2/issues/1652)**
    保守性を高めるために、コアエクステンションには認証クライアントをこれ以上追加しない。
    認証クライアントの追加はユーザエクステンションの形でなされるべきである。
-4. **クロージャを使うときは**、たとえ使用されないものがある場合でも、**渡されたすべてのパラメータをシグニチャに含める** ことが推奨される。
+4. **クロージャを使うときは**、たとえ使用されないものがある場合でも、**渡されるすべてのパラメータをシグニチャに含める** ことが推奨される。
    このようにすると、全ての情報が直接に見えるので、コードの修正やコピーがより容易になり、どのパラメータが実際に利用できるかをドキュメントで調べる必要がなくなる。
    ([#6584](https://github.com/yiisoft/yii2/pull/6584), [#6875](https://github.com/yiisoft/yii2/issues/6875))
 5. データベーススキーマでは **unsigned int より int** を使う。
diff --git a/docs/internals-ja/translation-workflow.md b/docs/internals-ja/translation-workflow.md
index f37d31553c..24b3e0f8bd 100644
--- a/docs/internals-ja/translation-workflow.md
+++ b/docs/internals-ja/translation-workflow.md
@@ -12,12 +12,12 @@ Yii は国際的なアプリケーションと開発者にとって役に立つ
 
 メッセージの翻訳を開始するためには:
 
-1. `framework/messages/config.php` をチェックして、あなたの言語が `languages` のリストに挙っていることを確認してください。
-   もし挙っていなければ、あなたの言語をそこに追加します (リストをアルファベット順に保つことを忘れないでください)。
+1. `framework/messages/config.php` をチェックして、あなたの言語が `languages` のリストに載っていることを確認してください。
+   もし無ければ、あなたの言語をそこに追加します (リストをアルファベット順に保つことを忘れないでください)。
    言語コードの形式は、例えば `ru` や `zh-CN` のように、[IETF言語タグ](http://ja.wikipedia.org/wiki/IETF%E8%A8%80%E8%AA%9E%E3%82%BF%E3%82%B0) に従うべきです。
 2. `framework` に入って、`yii message/extract messages/config.php` を走らせます。
 3. `framework/messages/your_language/yii.php` のメッセージを翻訳します。ファイルは必ず UTF-8 エンコーディングを使って保存してください。
-4. [プルリクエスト](https://github.com/yiisoft/yii2/blob/master/docs/internals/git-workflow.md) をします。
+4. [プルリクエスト](git-workflow.md) をします。
 
 あなたの翻訳を最新状態に保つために、`yii message/extract messages/config.php` を再び走らせることが出来ます。
 このコマンドは、変更のなかった箇所には触れることなく、自動的にメッセージを再抽出してくれます。

From b2e8bf255218eeb2da0cc4d8bfe3a9ceb1b653fe Mon Sep 17 00:00:00 2001
From: Mohamad Mohebifar <netfars@gmail.com>
Date: Tue, 26 May 2015 15:47:11 +0430
Subject: [PATCH 4/4] Update PHPDoc Comment

---
 framework/base/Widget.php | 1 +
 1 file changed, 1 insertion(+)

diff --git a/framework/base/Widget.php b/framework/base/Widget.php
index 76a08951af..742fb2193a 100644
--- a/framework/base/Widget.php
+++ b/framework/base/Widget.php
@@ -85,6 +85,7 @@ class Widget extends Component implements ViewContextInterface
      * The widget rendering result is returned by this method.
      * @param array $config name-value pairs that will be used to initialize the object properties
      * @return string the rendering result of the widget.
+     * @throws \Exception
      */
     public static function widget($config = [])
     {