Yii2 updating two related models does not show data of the second - activerecord

Question

I have two related models in hasToMany relation. The first is Invoices and the second is InvoiceItems. As a prototype process, I'm trying to conjugate the two models through the update view of the InvoicesController using the following code in actionUpdate of InvoicesController:
...
use common\models\Invoices;
use common\models\InvoicesSearch;
use common\models\InvoiceItems;
...
public function actionUpdate($id)
{
$model = $this->findModel($id);
$invoiceItems = new InvoiceItems();
if ($model->load(Yii::$app->request->post()) && $model->save()) {
$invoiceItems->invoice_id = $model->id;
if ($invoiceItems->load(Yii::$app->request->post()) && $invoiceItems->save()){
return $this->redirect(['view', 'id' => $model->id]);
}
else{
// return false;
}
} else {
$invoiceItems->invoice_id = $model->id;
return $this->render('update', [
'model' => $model,
'invoiceItems' => $invoiceItems,
]);
}
}
The following in update view:
<div class="invoices-update">
<h1><?= Html::encode($this->title) ?></h1>
<?= $this->render('_form', [
'model' => $model,
'invoiceItems' => $invoiceItems,
]) ?>
</div>
Finally, the following in _form view:
<div class="invoices-form">
<?php $form = ActiveForm::begin(); ?>
<?= $form->field($model, 'created')->textInput() ?>
<?= $form->field($model, 'type')->textInput(['maxlength' => true]) ?>
<hr />
<?= $form->field($invoiceItems, 'item_id')->textInput();?>
<?= $form->field($invoiceItems, 'unit_id')->textInput();?>
<?= $form->field($invoiceItems, 'qty')->textInput();?>
<div class="form-group">
<?= Html::submitButton($model->isNewRecord ? Yii::t('app', 'Create') : Yii::t('app', 'Update'), ['class' => $model->isNewRecord ? 'btn btn-success' : 'btn btn-primary']) ?>
</div>
<?php ActiveForm::end(); ?>
</div>
The above code succeeded in saving data in invoice_items table. However, the update view form has empty fields for InvoiceItems model. i.e item_id, unit_id and qty are empty in the update form after saving.
Notice: This is initial code, i.e I will work later to be able to add many items to the invoice, but now I just try to have one item related to the invoice.

Answer 1

Seems the update view is empty because you render and empty InvoceItmes ..
$invoiceItems = new InvoiceItems();
you render update view in else section and this section the value posted are not loaded
$model = $this->findModel($id);
$invoiceItems = new InvoiceItems();
if ($model->load(Yii::$app->request->post()) && $model->save()) {
$invoiceItems->invoice_id = $model->id;
if ($invoiceItems->load(Yii::$app->request->post()) && $invoiceItems->save()){
return $this->redirect(['view', 'id' => $model->id]);
}
else{
// return false;
}
} else {//****** here the $invoceItems is empty (It has just been created) ***
//$invoiceItems->invoice_id = $model->id;
$invoceItems= findInvoceItmesModel($model->id);
return $this->render('update', [
'model' => $model,
'invoiceItems' => $invoiceItems,
]);
}
for populate the data for $invoceItems you need somethings like
protected function findInvoiceItemsModel($id)
{
if (($model = InvociceItems::findOne($id)) !== null) {
return $model;
} else {
throw new NotFoundHttpException('The requested page does not exist.');
}
}
Obviously this is for a single model.. you must refactory form more than one..