Debugging a Twig View

Just a quick note here to save future hunting.

Ever seen this crap error message?

An exception has been thrown during the rendering of a templat

It totally sucks, right? And then you try debugging with XDebug, only to find you can’t most of the time, since Twig uses eval().

Anyway, to save you looking, if you set a breakpoint where that message is thrown you can get to see your own Exception:

vendor/twig/twig/lib/Twig/Template.php

Look at line 401 (this may have changed in later versions):

} catch (Exception $e) {
    throw new Twig_Error_Runtime(sprintf('An exception has been thrown during the rendering of a template ("%s").', $e->getMessage()), -1, $this->getTemplateName(), $e);
}

You can now see your Exception!