Symfony2 Twig: url /path functions do not exist when loading templates with custom loader

Question

I wrote a custom DatabaseTwigLoader, based on this recipe: http://twig.sensiolabs.org/doc/recipes.html#using-a-database-to-store-templates

It works fine. I am using this loader to load email templates from the DB, render them and send them using swift mailer.

The problem is, when rendering the templates, I can't use the path or the url twig functions. The error returned is:

The function "path" does not exist in "NEW_POST_ON_YOUR_GOAL" at line 6 (500 Internal Server Error)

However, variable interpolation and filters are applied and template inheritance works.

Do I need to register the url / path functions with the custom loader? Is it something to do with these functions being dependant on routing?

Thanks in advance.

** The implementation of the solution as suggested by @MolecularMan **

I had to add the routing extension to the twigEnvironment. I did this using the TwigEnvironment::addExtension() method.

In order to achieve this using DI, I had to extend the urlGenerator class (passed as the constructor argument to the routing_extension service).

The UrlGenerator takes a routeCollection object as a constructor argument. So I pass the router service as a constructor argument to my extended urlGenerator, so that I can extract the routecollection and pass it to parent::__contruct()

In order to achieve this using DI, I had to extend the urlGenerator class (passed as the constructor argument to the routing_extension service).

The UrlGenerator takes a routeCollection object as a constructor argument. So I pass the router service as a constructor argument to my extended urlGenerator, so that I can extract the routecollection and pass it to parent::__contruct()

My services.yml file looks like this:

twig_db:
    class: %twig.class%
    arguments: [@twig_db_loader]
    calls: [[ addExtension, [@routing_extension] ]]
url_generator:
    class: ZT\UserBundle\Services\UrlGenerator
    arguments: [@router, @request_context, @logger]
request_context:
    class: Symfony\Component\Routing\RequestContext
routing_extension:
    class: Symfony\Bridge\Twig\Extension\RoutingExtension
    arguments: [@url_generator]
twig_db_loader:
    class: ZT\UserBundle\Services\DatabaseTwigLoader
    arguments: [@doctrine.orm.entity_manager]

If you are following the recipe you are creating twig environment from scratch without router extension. — Molecular Man
– Molecular Man, Commented Mar 31, 2013 at 7:29
THanks @MolecularMan. I had to add the routing extension to the twigEnvironment. I did this uing the TwigEnvironment::addExtension() method. — Rob MacGregor
– Rob MacGregor, Commented Apr 6, 2013 at 14:05

pliashkou · Accepted Answer · 2015-05-18 19:14:45Z

0

You should register RoutingExtension:

$loader = new \Twig_Loader_Filesystem(array(__DIR__ . '/../../Resources/views'));
$twig = new \Twig_Environment($loader);

$twig->addExtension(new RoutingExtension($this->getMock('Symfony\Component\Routing\Generator\UrlGeneratorInterface')));
$twig->render('your_view.html.twig');

answered May 18, 2015 at 19:14

pliashkou

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