Symfony not loading runtime Twig extension - php

Question

I followed the example on Symfony 3.4 docs in order to load a Twig extension at runtime but it doesn't load: what I'am doing wrong?
IN: src/PlotlyBundle/Twig/AppRuntime.php
<?php
namespace PlotlyBundle\Twig;
class AppRuntime
{
public function __construct()
{
}
public function biDraw()
{
return 'awesome text here';
}
}
IN: src/PlotlyBundle/Resources/config/services.yml
services:
plotly.twig_runtime:
class: PlotlyBundle\Twig\AppRuntime
public: true
tags:
- { name: twig.runtime }
IN: src/PlotlyBundle/Twig/AppExtension.php
<?php
namespace PlotlyBundle\Twig;
use PlotlyBundle\Twig\AppRuntime;
class AppExtension extends \Twig_Extension
{
public function getFunctions()
{
return [
new \Twig_SimpleFunction(
'bi_draw',
array(AppRuntime::class, 'biDraw')
),
];
}
}
IN: src/AppBundle/Controller/DashboardController.php
$twig = $this->get('plotly.twig_runtime');
return $this->render(
'dashboard/index.html.twig'
);
IN: app/Resources/views/dashboard/index.html.twig
{{ bi_draw() }}

Answer 1

Thanks to #Federkun comments I fixed it by autowiring the Twig extension:
IN: src/PlotlyBundle/Resources/config/services.yml
services:
# default configuration for services in *this* file
_defaults:
# automatically injects dependencies in your services
autowire: true
# automatically registers your services as commands, event subscribers, etc.
autoconfigure: true
# this means you cannot fetch services directly from the container via $container->get()
# if you need to do this, you can override this setting on individual services
public: false
# this creates a service per class whose id is the fully-qualified class name
PlotlyBundle\Twig\:
resource: '../../../../src/PlotlyBundle/Twig/*'
tags:
- { name: twig.runtime }
The example on the Symfony docs (Creating Lazy-Loaded Twig Extensions) need an update to mention that auto-wiring MUST be enabled (as explained in the autoconfigure Option) in order for the example to work.
I submitted a PR to the Symfony docs.