How to check if a view exists in yii2?

Question

Yii

$model = Page::find()->where(['url' => $page])->one();
        return $this->render('$model->url', [
            'model' => $model,
        ]);

How to check if a view exists, and if not, then open the default "view"?

Answer 1

1. quotes around $model->url must be removed otherwise it will never work
2. :

if( file_exists(Yii::getAlias('@frontend').'/views/mydir'.$model->url.'.php')){
$view = $this->render($model->url, [
            'model' => $model,
        ]);
}else{
$view = $this->render('default', [
            'model' => $model,
        ]);
}
return $view;

Answer 2

Here it is necessary to check for the existence of the model, not the view.

Answer 3

Write a function.

...
use yii\base\ViewNotFoundException;
...
$get = Yii::$app->request->get();
$path = Yii::getAlias('@web').'/views/mydir/'.$get['url'];
...
try {
    // 1) тут пишите то что хотите проверить
    $this->render($path, ['model' => $model,]);
} catch (ViewNotFoundException $e) {
    // 2) тут выводите "удобную" ошибку, чтобы не закрывать ошибкой 500 или той которая вылезает
    $this->render('default', [ 'model' => $model,]);
}
...

You can also contact Yii::getAlias('@frontend')- what if the project is not in the folder frontend???
So no return $view;Either you get a view, or default
ViewNotFoundException keeps track of this, I abandoned file_exists in Yii a long time ago because it is not efficient and does not work, yes, if there is a file, errors will not come out, and if there is no file, you will encounter ViewNotFoundException
So why not immediately catch the error and just display it as text on the page?
Much better than a full page error.
Well, is it Easy? Truth? :)))