Yii2 Active Record的“ with”关系不返回子数据

我是YII框架的新手，我正在尝试使用活动记录和ORM框架。

有三张桌子请检查图像

这是我的Customer，OrderType和Orders的代码

class Customer extends \yii\db\ActiveRecord
{

public static function tableName()
{
    return 'Customer';
}

/**
 * @inheritdoc
 */
public function rules()
{
    return [
        [['id', 'name'], 'required'],
        [['id'], 'integer'],
        [['name'], 'string'],
    ];
}


 /**
 * @return \yii\db\ActiveQuery
 */
public function getCustomers()
{
    return $this->hasMany(CollectorCustomerMaster::className(), ['CollectorCode' => 'CollectorCode']);;
}

 }

 <?php
 namespace api\modules\v1\models;
 use Yii;
class OrderType extends \yii\db\ActiveRecord
{
/**
 * @inheritdoc
 */
public static function tableName()
{
    return 'OrderType';
}

/**
 * @inheritdoc
 */
public function rules()
{
    return [
        [['id', 'name'], 'required'],
        [['id'], 'integer'],
        [['name'], 'string'],
    ];
}
}

class Orders extends \yii\db\ActiveRecord
{

public static function tableName()
{
    return 'Orders';
}

/**
 * @inheritdoc
 */
public function rules()
{
    return [
        [['id', 'name','customer_id','order_type_id'], 'required'],
        [['id','customer_id','order_type_id'], 'integer'],
        [['name'], 'string'],
    ];
}


public function getOrderType(){
    return $this->hasOne(OrderType::className(), ['id' => 'order_type_id']);

}
}

如果我尝试查询订单类型的订单，订单类型数据不会出现。这是我的代码，

   if (Yii::$app->common->checkRequest('POST')) {
            //if ($this->validateRoute('getCustomers')) {
                $coCollector = Orders::find()->where(['id'=>'1'])->with('orderType')->one();;

                if(isset($coCollector)){
                    $data2 = null;

                    Yii::$app->common->setCode(200);
                    $response = ['status' => Yii::$app->common->getCode(), 'message' =>'Success', 'data' =>$coCollector,'data2'=>$data2];
                    return $response;
                }
           // }

        }

如果运行此命令，则会得到以下结果。

 {
"status": 200,
"message": "Success",
"data": {
    "id": "1",
    "customer_id": "4",
    "order_type_id": "1",
    "name": "Aptitude  "
},
"data2": null
}

如何也获取OrderType数据？请有人帮我。我在互联网上进行了彻底搜索，没有找到任何示例代码。