如何在yii2视图中获取关系表字段？

Question

I am want to get relational table field value in View,But the relational table maybe have not corresponding data.Can I use some method to replace the php code in Yii2 View?

// $model->relationTable maybe is null
<?= isset($model->relationalTable)?$model->relationalTable->field:'' ?>

I hope $model->relationalTable->field can work when $model->relationalTable is null.I wantn't a lot of if condition in view.

Answer 1

example:

in Model class:

public function getUser()
{
    return $this->hasOne(Customer::className(), ['id' => 'customer_id']);
}

Use:

$customers = Customer::find()
    ->joinWith('user')
    ->one();

Access:

$customers->user->id;

See the documentation here