symfony twig render dynamic twig code - symfony

Question

In my symfony2 action, i have:
$twigCode = '<li>{{ data.value }}</li>'; //In database
$datas = array(array( 'value' => 'line 1'), array( 'value' => 'line 2'));
return $this->render(
'...List.html.twig',
array(
'twigCode' => $twigCode,
'datas' => $datas
)
);
In my twig template, i want something like:
<ul>
{% for data in data %}
{{ render({{ twigCode }}, {data: data}) }}
{% endfor %}
</ul>
Expected that:
<ul>
<li>line 1</li>
<li>line 2</li>
</ul>

Answer 1

You could render and concatenate the twig fragments in the controller:
$templating = $this->container->get('templating');
$someTwig = '';
foreach ($datas as $data)
{
$someTwig .= $templating->render($twigCode, $data);
}
return $this->render('...List.html.twig', array('someTwig' => $someTwig));
Then in the twig:
<ul>
{{ someTwig | raw }}
</ul>
Otherwise, if you really want to do this in the twig you can write a Custom Twig Extension that implements a twig function 'render' so that something like your suggested twig snippet will work:
In the twig extension (you will need to register it as a service, see link above):
class MyTwigExtension extends \Twig_Extension
{
private $templating;
public function__construct($templating)
{
$this->templating = $templating;
}
public function getFunctions()
{
return array(
'render' => new \Twig_Filter_Method($this, 'render'),
);
}
public function render($twigFragment, array $data)
{
return $this->templating->render($twigFragment, $data);
}
}
Then in the twig:
<ul>
{% for data in data %}
{{ render(twigCode, data) | raw }}
{% endfor %}
</ul>
NB - it's possible 'render' is a reserved word for twig, so the custom twig function may need a different name.

Answer 2

You will have to use twig core or may be customized view rendering
Check below code
$loader = new Twig_Loader_Array(array(
'index.html' => 'Hello {{ name }}!',
));
$twig = new Twig_Environment($loader);
echo $twig->render('index.html', array('name' => 'Fabien'));
check here for documentation: http://twig.sensiolabs.org/doc/api.html#built-in-loaders