How does view.php locate the model?

Yii 2.0 General Discussions
1

In the definitive guide, there’s a tutorial on using gii. So I started looking through the generated code to understand the workflows. Here’s something that strikes as odd to me:




public function actionUpdate($id)

    {

        $model = $this->findModel($id);


        if ($model->load(Yii::$app->request->post()) && $model->save()) {

            return $this->redirect(['view', 'id' => $model->code]);

        } else {

            return $this->render('update', [

                'model' => $model,

            ]);

        }

    }

So when the user hits the Submit button and the model is updated, we are redirected to the Country’s view.php file, and the information we pass is “id”, which has the country code. So far so good, but now look at the “view” view:




<?php


use yii\helpers\Html;

use yii\widgets\DetailView;


/* @var $this yii\web\View */

/* @var $model app\models\Country */


$this->title = $model->name;

$this->params['breadcrumbs'][] = ['label' => 'Countries', 'url' => ['index']];

$this->params['breadcrumbs'][] = $this->title;

?>

<div class="country-view">


    <h1><?= Html::encode($this->title) ?></h1>


    <p>

        <?= Html::a('Update', ['update', 'id' => $model->code], ['class' => 'btn btn-primary']) ?>

        <?= Html::a('Delete', ['delete', 'id' => $model->code], [

            'class' => 'btn btn-danger',

            'data' => [

                'confirm' => 'Are you sure you want to delete this item?',

                'method' => 'post',

            ],

        ]) ?>

    </p>


    <?= DetailView::widget([

        'model' => $model,

        'attributes' => [

            'code',

            'name',

            'population',

        ],

    ]) ?>


</div>

Where does $model come from, given that it wasn’t passed by the controller?

2

Because you are redirected to view (actionView of this controller)

and the controller has this function


    public function actionView($id)

    {

        return $this->render('view', [

            'model' => $this->findModel($id),

        ]);

    }
3

Ah, thank you so much! I’m new to frameworks and so was hopelessly confused. I was under the impression that it was getting redirected to a view. :D