将新属性动态添加到Yii2框架中的现有模型对象

在Yii2框架中，是否可以将新属性动态添加到从数据库检索的现有对象中

范例

//Retrieve from $result
$result = Result::findone(1);
//Add dynamic attribute to the object say 'result'
$result->attributes = array('attempt' => 1);

如果不可能，请建议另一种最佳实施方法

最后，我将把结果转换为json对象。在我的应用程序中，在行为代码块中，我使用了如下方法：

'formats' => [
               'application/json' => Response::FORMAT_JSON,  
             ], 

class Result extends \yii\db\ActiveRecord implements Arrayable
{
    public $dynamic;

    // Implementation of Arrayable fields() method, for JSON
    public function fields()
    {
        return [
            'id' => 'id',
            'created_at' => 'created_at',
            // other attributes...
            'dynamic' => 'dynamic',
        ];
    }
    ...

{"id":1,"created_at":1499497557,"dynamic":{"field1":"value1","field2":2,"field3":3.33}}

---

您可以在模型中添加并定义一个公共变量，该变量将动态属性存储为关联数组。它看起来像这样：

'formats' => [
               'application/json' => Response::FORMAT_JSON,  
             ], 

class Result extends \yii\db\ActiveRecord implements Arrayable
{
    public $dynamic;

    // Implementation of Arrayable fields() method, for JSON
    public function fields()
    {
        return [
            'id' => 'id',
            'created_at' => 'created_at',
            // other attributes...
            'dynamic' => 'dynamic',
        ];
    }
    ...

{"id":1,"created_at":1499497557,"dynamic":{"field1":"value1","field2":2,"field3":3.33}}

…在您的操作中，将一些动态值传递给您的模型，并将所有内容作为JSON返回：

public function actionJson()
{
    \Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;

    $model = Result::findOne(1);
    $model->dynamic = [
        'field1' => 'value1',
        'field2' => 2,
        'field3' => 3.33,
    ];

    return $model;
}

结果，您将得到如下JSON：

'formats' => [
               'application/json' => Response::FORMAT_JSON,  
             ], 

class Result extends \yii\db\ActiveRecord implements Arrayable
{
    public $dynamic;

    // Implementation of Arrayable fields() method, for JSON
    public function fields()
    {
        return [
            'id' => 'id',
            'created_at' => 'created_at',
            // other attributes...
            'dynamic' => 'dynamic',
        ];
    }
    ...

{"id":1,"created_at":1499497557,"dynamic":{"field1":"value1","field2":2,"field3":3.33}}

---

它正在工作。是否可以不在模型类中声明fields函数。不幸的是，如果使用ActiveRecord，这是不可能的。