Fix extensibility issue

src/BaseActiveRecordTrait.php

@@ -44,12 +44,8 @@ trait BaseActiveRecordTrait
      */
     public function __get(string $name)
     {
-        if (isset($this->attributes[$name]) || array_key_exists($name, $this->attributes)) {
-            return $this->attributes[$name];
-        }
-
         if ($this->hasAttribute($name)) {
-            return null;
+            return $this->getAttribute($name);
         }
 
         if (isset($this->related[$name]) || array_key_exists($name, $this->related)) {

tests/ActiveRecordTest.php

@@ -10,6 +10,7 @@
 use Yiisoft\ActiveRecord\Tests\Stubs\ActiveRecord\Cat;
 use Yiisoft\ActiveRecord\Tests\Stubs\ActiveRecord\Customer;
 use Yiisoft\ActiveRecord\Tests\Stubs\ActiveRecord\CustomerClosureField;
+use Yiisoft\ActiveRecord\Tests\Stubs\ActiveRecord\CustomerExtraAttributes;
 use Yiisoft\ActiveRecord\Tests\Stubs\ActiveRecord\CustomerWithAlias;
 use Yiisoft\ActiveRecord\Tests\Stubs\ActiveRecord\Dog;
 use Yiisoft\ActiveRecord\Tests\Stubs\ActiveRecord\Item;
@@ -763,4 +764,14 @@ public function testToArrayWithClosure(): void
             $customer->toArray(),
         );
     }
+
+    public function testGetExtraArrtibute()
+    {
+        $this->checkFixture($this->db, 'customer');
+
+        $customerQuery = new ActiveQuery(CustomerExtraAttributes::class, $this->db);
+        $customer = $customerQuery->findOne(1);
+
+        $this->assertSame($customer->sex, 'm');
+    }
 }

tests/Stubs/ActiveRecord/CustomerExtraAttributes.php

@@ -0,0 +1,48 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\ActiveRecord\Tests\Stubs\ActiveRecord;
+
+use Yiisoft\ActiveRecord\ActiveRecord;
+
+/**
+ * Class CustomerClosureField.
+ *
+ * @property int $id
+ * @property string $name
+ * @property string $email
+ * @property string $address
+ * @property int $status
+ * @property string $sex
+ */
+final class CustomerExtraAttributes extends ActiveRecord
+{
+    private array $extraAttributes = [
+        'sex' => 'm',
+    ];
+
+    public function getTableName(): string
+    {
+        return 'customer';
+    }
+
+    public function getAttribute(string $name): mixed
+    {
+        if (array_key_exists($name, $this->extraAttributes)) {
+            return $this->extraAttributes[$name];
+        }
+
+        return parent::getAttribute($name);
+    }
+
+    public function getAttributes(array $names = null, array $except = []): array
+    {
+        return array_merge(parent::getAttributes($names, $except), $this->extraAttributes);
+    }
+
+    public function hasAttribute($name): bool
+    {
+        return array_key_exists($name, $this->extraAttributes) || parent::hasAttribute($name);
+    }
+}