Access Twig Extention function in Twig view

Question

I try to get access to a Twig Extention function I have written.

// AppBundle/Twig/AppExtention.php

namespace AppBundle\Twig;

class AppExtension extends \Twig_Extension
{
  public function getFunctions() {
    return [
      new \Twig_Function('testMethod', 'testMethod'),
    ];
  }

  public function testMethod() {
    return 'blubb';
  }
}

Now I try to access the funtion by {{ testMethod() }}, but I get the following error:

UndefinedFunctionException in <Hex for cached view>.php line 68: Attempted to call function "testMethod" from the global namespace.

I cleared the cache and tried to search for the error, but I found nothing that helped me. Maybe here can someone help.

Answer 1

You are defining your Twig_Function wrong, as it stands now, you told Twig to look for a global function, defined outside any class.

If you want to tell Twig to look inside the current class, you can do this with:

public function getFunctions() {
    return [
        new \Twig_SimpleFunction('testMethod', array($this, 'testMethod')),
    ];
}