Laravel Eloquent填充方法行为

Question

在我的Eloquent Model上调用的fill方法不会更新对象属性，而是允许访问这些属性，就好像它是一个数组一样。这是期望的行为，如果是，为什么？

您可以在php artisan tinker

中运行以下代码

class MyTestClass extends Illuminate\Database\Eloquent\Model { 
  protected $fillable = ['testArrayProperty', 'testPrimitiveProperty', 'testObjectProperty']; 
  public $testArrayProperty; 
  public $testObjectProperty; 
  public $testPrimitiveProperty; 
}
$object = new MyTestClass;
$testObject = new stdClass();
$testObject->test = 'Test';
$object->fill(["testArrayProperty" => ["testKey" => "testValue"], "testObjectProperty" => $testObject, "testPrimitiveProperty" => "test" ]);

$object->testArrayProperty; //returns null
$object["testArrayProperty"];
$object->testObjectProperty; //returns null
$object["testObjectProperty"];
$object->testPrimitiveProperty; //returns null
$object["testPrimitiveProperty"];