你應該先var_dump models 看看內容是甚麼!!
hasMany : 一對多 => 一個客戶可以有很多訂單
hasOne : 一對一 => 一個訂單只能有一個客戶

把兩張 table join 起來:

use app\models\Order;
class Customer extends model
{
  public function getOrder()
    {
    	return $this->hasMany(Order::classname(), ['id' => 'order_id']);
    }
}

use app\models\Customer;
class Customer Controller extends Controller
{
   $customer = Customer::find()->joinwith('order')->all();
   return $this->render('index',['customer' => $customer])
}

HTML :  一對多的狀況
foreach($customer as $key => $val){    //
    $val->id; //各自的 customer['id']
    foreach($val['order'] as $or_key => $or_val){
        $or_val;    //訂單的資訊
    }
}

你應該先var_dump models 看看內容是甚麼!!
hasMany : 一對多 => 一個客戶可以有很多訂單
hasOne : 一對一 => 一個訂單只能有一個客戶

把兩張 table join 起來:

use app\models\Order;
class Customer extends model
{
  public function getOrder()
    {
    	return $this->hasMany(Order::classname(), ['id' => 'order_id']);
    }
}

use app\models\Customer;
class Customer Controller extends Controller
{
   $customer = Customer::find()->joinwith('order')->all();
   return $this->render('index',['customer' => $customer])
}

HTML :  一對多的狀況
foreach($customer as $key => $val){    //
    $val->id; //各自的 customer['id']
    foreach($val['order'] as $or_key => $or_val){
        $or_val;    //訂單的資訊
    }
}

<?php foreach ($orders as $order):?>
<?php echo $order['order_name'];?>
<?php endforeach;?>

use models\model;

Class DemoController extends Controller
{
    public function actionIndex(){
       $model = model::find()->all();
       return $this->render('index',[
            'model' => $model
       ]);
    }
}

前台在 
<?php echo $model->id; ?>

因为migrate不光是支持mysql迁移，还支持其他数据库，而其他数据库不一定有这个类型。。。所以migrate也没有。。。

controller传$model到前台，前台$model->id就可以了~