Twig：将文件路径作为参数传递给url

Question

I want to make files downloadble on click, but it does not work. Here comes my code:

files.html.twig

{% set filepath = asset('bundles/example/files/filename.pdf') %}
<a href="{{ url('_bundle_route_to_download', { 'filepath': filepath }) }}">
<button class="button button-icon button-download">Download</button></a>

controller.php

 /**
    * @Route("/example/download/{filepath}", name="_bundle_route_to_download")
    */
    public function downloadFile($filepath)
    {
      //...
    }

This is the error I get:

No route found for "GET    /example/download//bundles/example/files/filename.pdf%3F1418390151

What is wrong about my syntax?

Answer 1

Your Syntax is not wrong, but Symfony2 Routing is looking for a route that does not exist. You need to url_encode your parameter.

The Symfony2 Routing is looking for a URL matching /example/download//bundles/example/files/ which will not be found.

{% set filepath = (asset('bundles/example/files/filename.pdf'))|url_encode %}
<a href="{{ url('_bundle_route_to_download', { 'filepath': filepath }) }}">
<button class="button button-icon button-download">Download</button></a>

It is untested but should be doing the trick.

For more Information, see Twig Url Encode

Though I'd not recommend to pass it through as a parameter ... -> that's how you would do that.