Why does it give an error "missing required parameters: id"? - yii2

Question

I understand that the error occurred due to the confusion of variables, although these are my assumptions .. The fact is that this error occurred in the update and in the view: update and view. I have already tried everything .. Please poke your nose where I went wrong?
My controller in which I pass two actions view and update:
public function actionView($id)
{
return $this->render('view', [
'faq' => $this->findModel($id),
]);
}
public function actionUpdate($id)
{
$faq = FaqLang::findOne($id);
$faqLang = Faq::findOne($faq->faq_id);
if ($faq->load(Yii::$app->request->post()) && $faqLang->load(Yii::$app->request->post()) && Model::validateMultiple([$faq, $faqLang]))
{
$faqLang->save(false);
$faq->save(false);
return $this->redirect(['view', 'id' => $faq->id]);
}
return $this->render('update', [
'faq' => $faq,
'faqLang' => $faqLang,
]);
}
protected function findModel($id)
{
if (($faq = FaqLang::findOne($id)) !== null) {
return $faq;
}
throw new NotFoundHttpException(Yii::t('app', 'The requested page does not exist.'));
}
view.php in which I am trying to display data using DetailView
<?php
use yii\helpers\Html;
use yii\widgets\DetailView;
/* #var $this yii\web\View */
/* #var $faqLang app\modules\admin\models\Faq */
/* #var $faq app\modules\admin\models\FaqLang */
//$this->title = $faq->id;
$this->params['breadcrumbs'][] = ['label' => Yii::t('app', 'Faqs'), 'url' => ['index']];
$this->params['breadcrumbs'][] = $this->title;
?>
<div class="faq-view">
<h1><?= Html::encode($this->title) ?></h1>
<p>
<?= Html::a(Yii::t('app', 'Update'), ['update', 'id' => $faq->id], ['class' => 'btn btn-primary']) ?>
<?= Html::a(Yii::t('app', 'Delete'), ['delete', 'id' => $faq->id], [
'class' => 'btn btn-danger',
'data' => [
'confirm' => Yii::t('app', 'Are you sure you want to delete this item?'),
'method' => 'post',
],
]) ?>
</p>
<?= DetailView::widget([
'faq' => $faq,
'attributes' => [
'id',
['attribute' => 'name', 'value' => 'faqLang.name'],
['attribute' => 'body', 'value' => 'faqLang.body:ntext'],
'put_date',
[
'attribute' => 'hide',
'format' => 'html',
'value' => function($model) {
if($model->hide == 'show')
return 'Нет';
else
return 'Да';
}
],
],
]) ?>
update.php through which the records are updated
<?php
use yii\helpers\Html;
/* #var $this yii\web\View */
/* #var $faqLang app\modules\admin\models\Faq */
/* #var $faq app\modules\admin\models\FaqLang */
$this->title = Yii::t('app', 'Update Faq: ' . $faq->id, [
'nameAttribute' => '' . $faq->id,
]);
$this->params['breadcrumbs'][] = ['label' => Yii::t('app', 'Faqs'), 'url' => ['index']];
$this->params['breadcrumbs'][] = ['label' => $faq->id, 'url' => ['view', 'id' => $faq->id]];
$this->params['breadcrumbs'][] = Yii::t('app', 'Update');
?>
<div class="faq-update">
<h1><?= Html::encode($this->title) ?></h1>
<?= $this->render('_form', [
'faq' => $faq,
'faqLang' => $faqLang,
]) ?>
</div>
And 2 related Faq and FaqLang models
Faq.php
public function getFaqLang()
{
return $this->hasMany(FaqLang::className(), ['faq_id' => 'id']);
}
FaqLang.php
public function getFaq()
{
return $this->hasOne(Faq::className(), ['id' => 'faq_id']);
}

Answer 1

You may be seeing this error because the request path/query string you're using to run your controller actions does not include the $id parameter.
If you specify a method parameter in a controller action, that parameter must be defined in your routes, and passed in the request
Your action methods are as follows:
public function actionView($id)
{
....
}
Which expects a route like
'/view/<id:\d+>' => 'admin/faqs/view'
and
public function actionUpdate($id)
{
...
}
Which expects a route like
'/update/<id:\d+>' => 'admin/faqs/update'
So for example, for the request /view/123 , the value 123 is passed as the value of $id into the actionView($id) method.
If you have a route set up like
'/view' => 'admin/faqs/view'
There's no id parameter defined, and the controller will throw the error missing required parameters: id