Yii2: How to access a table column via a relation - yii2

Question

I have two tables, dpd and cabang. One cabang can only have one dpd and each cabang should have a dpd.
This is the relation in my "Cabang" model :
public function getIdDpd()
{
return $this->hasOne(Dpd::className(), ['id_dpd' => 'id_dpd']);
}
I try to access "dpd" attribute in "dpd" table in my view, I tried to var_dump it but still got the same error :
$model = Cabang::find()
->joinWith('idDpd')
->all();
var_dump($model->dpd);
Note : 'dpd' in var_dump($model->dpd) refered to the column name in 'Dpd' table. I have a column name 'dpd' in my 'dpd' table. I also tried $model->idDpd->dpd but it return the same error.
What am I doing wrong? Thanks

Answer 1

Your mistake is
$model->dpd
where you are trying to access it assuming that $model has the Dpd object, but it is holding the Cabang object and you should use the relation name to get the Dpd object and then call the field name like below.
$model->idDpd->dpd
EDIT: You are using ->all() in your query not ->one() and hence you cannot simply do $model->idDpd->dpd right after the query, you need to loop through the records and then call the relation, i thought you might be doing the same way but anyway see below how to use it.
$cabangs = Cabang::find()
->joinWith('idDpd')
->all();
foreach($cabangs as $index=>$model){
$model->idDpd->dpd;
}