Fixes #6678: `yii\behaviors\SluggableBehavior` will generate a new slug only…

framework/CHANGELOG.md

@@ -16,6 +16,7 @@ Yii Framework 2 Change Log
 - Enh #6618: Added Model::addErrors() (slavcodev, pana1990)
 - Chg #6427: In case of invalid route web application now throws exception with "Page not found" instead of "Invalid Route" (cebe, samdark)
 - Chg #6641: removed zero padding from ETag strings (DaSourcerer)
+- Chg #6678: `yii\behaviors\SluggableBehavior` will generate a new slug only when the slug attribute is empty or the source attribute is changed (qiangxue)
 
 2.0.1 December 07, 2014
 -----------------------

framework/behaviors/SluggableBehavior.php

@@ -137,7 +137,7 @@ class SluggableBehavior extends AttributeBehavior
             $attributes = (array) $this->attribute;
             /* @var $owner BaseActiveRecord */
             $owner = $this->owner;
-            if (!$owner->getIsNewRecord() && !empty($owner->{$this->slugAttribute})) {
+            if (!empty($owner->{$this->slugAttribute})) {
                 $isNewSlug = false;
                 if (!$this->immutable) {
                     foreach ($attributes as $attribute) {