Twig and dependency injector

Question

Twig and dependency injector

Mathieu Robardey Mar '17

Created Mar '17	Last Reply Mar '17	Replies 3	Views 642	Votes 0

Mathieu Robardey 782

Mar '17

I'm adding Twig support on existing apps that has been written in Volt.

I'm looking to replicate the same behavior of Volt that expose DI services: {{ config }} or {{ this.config }} but I'm not sure how volt do that (even by looking source).

For now my working way is to iterate over $di->getServices() and assign each services to the view object

Is the right way to do that?

Mat

<?php
class Twig extends Engine implements EngineInterface
{
  protected $twig;

  public function __construct($view, $di, $options = [])
  {
    $this->setDI($di);

    $loader     = new \Twig_Loader_Filesystem($di->getView()->getViewsDir());
    $this->twig = new TwigEnvironment($di, $loader, [
      'debug' => $di->getEnv()->development
    ]);

    $this->twig->addExtension( new \Twig_Extension_Debug() );

    // Expose phalcon services to twig
    foreach ($di->getServices() as $name => $obj) {
      $view->$name = $obj;
    }

    parent::__construct($view, $di);

  }

}

Wojciech Ślawski · Answer 1 · 2017-03-21T04:12:19-07:00

https://github.com/phalcon/incubator/tree/master/Library/Phalcon/Mvc/View/Engine Engine class extends Injectable, so it will work the same as in volt.

Mathieu Robardey · Answer 2 · 2017-03-21T05:21:27-07:00

Hm I can't get this working (no errors, no warnigs). After looking the constructor, ( https://github.com/phalcon/cphalcon/blob/master/phalcon/mvc/view/engine.zep#L40 ), they need ViewBaseInterface and DiInterface.

But in my Twig class, the constructor $view is View and $di is FactoryDefault even from the simple service :

$di->set('view', function() {

    $view = new \Phalcon\Mvc\View();

    $view->setViewsDir('../app/views/');

    $view->registerEngines(
        ['.twig' => 'My\View\Engine\Twig']
    );

    return $view;
});

In the incubator Twig class, they use $view ViewBaseInterface and $di DiInterface => https://github.com/phalcon/incubator/blob/master/Library/Phalcon/Mvc/View/Engine/Twig.php#L28-L30

Wojciech Ślawski · Answer 3 · 2017-03-23T02:36:15-07:00

Well there are not twig tests in incubator, can't you just use classes from incubator and check it out? As i see this code just same as volt should work, so for example to acces service config just {{ config.someKey }}

Mathieu Robardey · Answer 4 · 2017-03-24T01:25:31-07:00

I can't use the Incubator Twig class because I need to apply some business logic in both constructor and render method.

I'm finally using $this->twig->addGlobal('config', $di->get('config')); and work as expected.

Seems better since I do not need all services, I was just thinking the services will automagically exposed like volt

Wojciech Ślawski · Answer 5 · 2017-03-24T01:34:18-07:00

You can always extend them. Well i will need to check incubator then if it works like in volt or not. To be honest it fells more like you should use some twig extension.