Add proper error handler to backend config

Author: cebe

backend/config/components.php

@@ -8,7 +8,9 @@
     'request' => [
         'cookieValidationKey' => file_get_contents(__DIR__ . '/cookie-validation.key'),
     ],
-
+    'errorHandler' => [
+        'errorAction' => 'site/error',
+    ],
     'urlManager' => [
         'enablePrettyUrl' => true,
         'enableStrictParsing' => true,

backend/controllers/SiteController.php

@@ -3,12 +3,22 @@
 namespace backend\controllers;
 
 use yii\web\Controller;
+use yii\web\ErrorAction;
 
 /**
  *
  */
 class SiteController extends Controller
 {
+    public function actions()
+    {
+        return array_merge(parent::actions(), [
+            'error' => [
+                'class' => ErrorAction::class,
+            ],
+        ]);
+    }
+
     public function actionIndex()
     {
         return $this->render('index');