Fixes #13728: Fixed the bug when `yii\behaviors\SluggableBehavior` wasn't preserving immutable slug values

framework/CHANGELOG.md

@@ -46,6 +46,7 @@ Yii Framework 2 Change Log
 - Bug #13670: Fixed alias option from console when it includes `-` or `_` in option name (pana1990)
 - Enh: Added `yii\di\Instance::__set_state()` method to restore object after serialization using `var_export()` function (silvefire)
 - Enh #13695: `\yii\web\Response::setStatusCode()` method now returns the Response object itself (kyle-mccarthy)
+- Bug #13728: Fixed the bug when `yii\behaviors\SluggableBehavior` wasn't preserving immutable slug values (Kolyunya)
 - Bug #13707: Fixed `\yii\web\ErrorHandler` and `\yii\web\ErrorAction` not setting correct response code to response object before rendering error view (samdark)
 - Enh #13698: `yii\grid\DataColumn` filter is automatically generated as dropdown list in case of `format` set to `boolean` (bizley)
 - Enh #13254: Core validators no longer require Yii::$app to be set (sammousa)

framework/behaviors/SluggableBehavior.php

@@ -138,17 +138,17 @@ class SluggableBehavior extends AttributeBehavior
      */
     protected function getValue($event)
     {
-        if ($this->attribute !== null) {
-            if ($this->isNewSlugNeeded()) {
-                $slugParts = [];
-                foreach ((array) $this->attribute as $attribute) {
-                    $slugParts[] = ArrayHelper::getValue($this->owner, $attribute);
-                }
+        if (!$this->isNewSlugNeeded()) {
+            return $this->owner->{$this->slugAttribute};
+        }
 
-                $slug = $this->generateSlug($slugParts);
-            } else {
-                return $this->owner->{$this->slugAttribute};
+        if ($this->attribute !== null) {
+            $slugParts = [];
+            foreach ((array) $this->attribute as $attribute) {
+                $slugParts[] = ArrayHelper::getValue($this->owner, $attribute);
             }
+
+            $slug = $this->generateSlug($slugParts);
         } else {
             $slug = parent::getValue($event);
         }
@@ -173,6 +173,10 @@ class SluggableBehavior extends AttributeBehavior
             return false;
         }
 
+        if ($this->attribute === null) {
+            return true;
+        }
+
         foreach ((array)$this->attribute as $attribute) {
             if ($this->owner->isAttributeChanged($attribute)) {
                 return true;

tests/framework/behaviors/SluggableBehaviorTest.php

@@ -168,6 +168,44 @@ class SluggableBehaviorTest extends TestCase
         $model->save();
         $this->assertEquals('test-name', $model->slug);
     }
+
+    /**
+     * @depends testSlug
+     */
+    public function testImmutableByAttribute()
+    {
+        $model = new ActiveRecordSluggable();
+        $model->getSluggable()->immutable = true;
+
+        $model->name = 'test name';
+        $model->validate();
+        $this->assertEquals('test-name', $model->slug);
+
+        $model->name = 'another name';
+        $model->validate();
+        $this->assertEquals('test-name', $model->slug);
+    }
+
+    /**
+     * @depends testSlug
+     */
+    public function testImmutableByCallback()
+    {
+        $model = new ActiveRecordSluggable();
+        $model->getSluggable()->immutable = true;
+        $model->getSluggable()->attribute = null;
+        $model->getSluggable()->value = function () use ($model) {
+            return $model->name;
+        };
+
+        $model->name = 'test name';
+        $model->validate();
+        $this->assertEquals('test name', $model->slug);
+
+        $model->name = 'another name';
+        $model->validate();
+        $this->assertEquals('test name', $model->slug);
+    }
 }
 
 /**