[9.x] Clear cast cache when setting attributes using arrow

src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php

@@ -1061,6 +1061,10 @@ public function fillJsonAttribute($key, $value)
             ? $this->castAttributeAsEncryptedString($key, $value)
             : $value;
 
+        if ($this->isClassCastable($key)) {
+            unset($this->classCastCache[$key]);
+        }
+
         return $this;
     }
 

tests/Integration/Database/DatabaseEloquentModelCustomCastingTest.php

@@ -216,6 +216,18 @@ public function testSettingRawAttributesClearsTheCastCache()
         $this->assertSame('117 Spencer St.', $model->address->lineOne);
     }
 
+    public function testSettingAttributesUsingArrowClearsTheCastCache()
+    {
+        $model = new TestEloquentModelWithCustomCast;
+        $model->typed_settings = ['foo' => true];
+
+        $this->assertTrue($model->typed_settings->foo);
+
+        $model->setAttribute('typed_settings->foo', false);
+
+        $this->assertFalse($model->typed_settings->foo);
+    }
+
     public function testWithCastableInterface()
     {
         $model = new TestEloquentModelWithCustomCast;
@@ -280,6 +292,7 @@ class TestEloquentModelWithCustomCast extends Model
         'other_password' => HashCaster::class.':md5',
         'uppercase' => UppercaseCaster::class,
         'options' => JsonCaster::class,
+        'typed_settings' => JsonSettingsCaster::class,
         'value_object_with_caster' => ValueObject::class,
         'value_object_caster_with_argument' => ValueObject::class.':argument',
         'value_object_caster_with_caster_instance' => ValueObjectWithCasterInstance::class,
@@ -351,6 +364,41 @@ public function set($model, $key, $value, $attributes)
     }
 }
 
+class JsonSettingsCaster implements CastsAttributes
+{
+    public function get($model, string $key, $value, array $attributes): ?Settings
+    {
+        if ($value === null) {
+            return null;
+        }
+
+        if ($value instanceof Settings) {
+            return $value;
+        }
+
+        $payload = json_decode($value, true, JSON_THROW_ON_ERROR);
+
+        return Settings::from($payload);
+    }
+
+    public function set($model, string $key, $value, array $attributes): ?string
+    {
+        if ($value === null) {
+            return null;
+        }
+
+        if (is_array($value)) {
+            $value = Settings::from($value);
+        }
+
+        if (! $value instanceof Settings) {
+            throw new \Exception("Attribute `{$key}` with JsonSettingsCaster should be a Settings object");
+        }
+
+        return $value->toJson();
+    }
+}
+
 class DecimalCaster implements CastsAttributes, DeviatesCastableAttributes, SerializesCastableAttributes
 {
     public function get($model, $key, $value, $attributes)
@@ -465,6 +513,31 @@ public function __construct($lineOne, $lineTwo)
     }
 }
 
+class Settings
+{
+    public ?bool $foo;
+    public ?bool $bar;
+
+    public function __construct(?bool $foo, ?bool $bar)
+    {
+        $this->foo = $foo;
+        $this->bar = $bar;
+    }
+
+    public static function from(array $data): Settings
+    {
+        return new self(
+            $data['foo'] ?? null,
+            $data['bar'] ?? null,
+        );
+    }
+
+    public function toJson($options = 0): string
+    {
+        return json_encode(['foo' => $this->foo, 'bar' => $this->bar], $options);
+    }
+}
+
 final class Decimal
 {
     private $value;