在Twig Extension中使用locateResource

Question

I wish to use the following inside of a Twig Extension

$kernel = $container->getService('kernel');
$path = $kernel->locateResource('@AdmeDemoBundle/path/to/file/Foo.png');

but this involved passing in the Kernel, which is bad. Plus I could not get it to work anyway when trying this method.

How can I access a resources path within a Twig Extension?

The Extension is already a Service. I can use Assetic to give me the URL, but I really want the path.

Answer 1

I had a similar need: i needed to pass to the filter the url of an image to display it in a for loop and build a string.

I passed the URL directly to the filter in this way:

{%  image '@AppBundle/Resources/public/images/my_asset.png' %}
    {% set resolved_asset_url = asset_url %}
{% endimage %}

{{ my_var|filter_name(resolved_asset_url)|raw(html) }}

In this way the Twig template resolve the correct resource's URL, sets it as a variable, and then I pass it to the filter from inside the template itself, without having to deal with kernel or something else.

Answer 2

If you want just to serve a download, you should create a Route that accomplishes that task.

In this way, you'll call the locator inside the route, and a simple

{{ path('route_that_does_the_locator_thing') }}

will be fine.

If you need instead to include a file in your template (ex. CSS, JS..), you need to declare your file as an asset, maybe using Assetic.