Yii2 render database content - yii2

Question

There is a textarea where user can edit some templates and can use variables like:
{{model.user.name}}
Application need to replace this variables with data and display HTML output.
We can write a small function that will replace variables from template with data but we need to use a template engine like Twig or Smarty.
https://github.com/yiisoft/yii2-twig
https://github.com/yiisoft/yii2-smarty
Now we can use ViewRenderer from Smarty or Twig.
$render = new ViewRenderer();
$content = $render->render($this->view,'template.twig',[
'model' => $model,
]);
But I see this error:
Unable to find template "template.twig" (looked into: .).
How can I use Smarty or Twig to render a template with the content from database in Yii2 ?

Answer 1

I found Mustache ( https://github.com/bobthecow/mustache.php ) and I'm using like this:
$m = new \Mustache_Engine();
echo $m->render("Hello {{model.client.firma}}",['model' => $model]);

Answer 2

You don't create a renderer manually, you configure your application components, like this:
[
'components' => [
'view' => [
'class' => 'yii\web\View',
'renderers' => [
'twig' => [
'class' => 'yii\twig\ViewRenderer',
'cachePath' => '#runtime/Twig/cache',
// Array of twig options:
'options' => [
'auto_reload' => true,
],
'globals' => ['html' => '\yii\helpers\Html'],
'uses' => ['yii\bootstrap'],
],
// ...
],
],
],
]
You are telling Yii that there is a renderer to handle templates with the .twig extension.
Then, all you need to do is add the .twigextension when calling render in your controller actions:
public function actionIndex()
{
return $this->render('index.twig');
Then put your twig templates in the view folders where the views normally go.
Read the documentation for the twig extension: Twig Extension for Yii 2
If you want to only use twig templates, you can avoid specifying the extension (.twig) if you set the default extension:
'components' => [
'view' => [
'defaultExtension' => 'twig',

Answer 3

You should create a twig component which will wrap around Twig_Environment. You can add yii\twig\Extension extension if you need. Then you should use it like this:
$renderedTemplate = Yii::$app->twig->render($template, $context);
If you really need to render a template from a string variable you may implement your own Twig_LoaderInterface. There is a Twig_Loader_String, but it's deprecated and you should not use it.