Comments to check '$comment->getOwner->isAnonymous()' instead of assuming anonymous is ID 0

@alexpott Yes we can. We can also use: comment.owner.anonymous ? 'by-anonymous' or any combo that reads the best.

@Tom Verhaeghe what are your thoughts here, any preference?

From our slides:)
http://drupaltwig.github.io/ThemeSystemBadCamp2014/#/5

The more people that know this magic/syntax sugar the better

@Tom Verhaeghe sorry our slides could be clearer.

{{ comment.owner.anonymous }} will get converted to PHP eventually. When it does, each "attribute" (the thing after the dot, Twig's language for what we usually refer to as a member variable or property) will be converted to PHP in the following ways:

// Array key.
$comment['owner']['anonymous'];
// Object property.
$comment->owner->anonymous;
// Also works for magic get (provided you implement magic isset).
$comment->__isset('owner')->isset('anonymous'); && $comment->__get('owner')->__get('anonymous');
// Object method.
$comment->owner()->anonymous();
// Object get method convention.
$comment->getOwner()->getAnonymous();
// Object is method convention.
$comment->isOwner()->isAnonymous();
// Method doesn't exist/dynamic method.
$comment->__call('owner')->__call('anonymous');

In that order of checking until it finds the correct PHP 'thing'.

In this specific case it will do the following (theory and rough equivalent):

if ($comment->__isset('owner')) {
  $owner = $comment->__get('owner');
  return $owner->isAnonymous();
}

Here's an example of all the things that work:

mkdir magic && cd magic
composer require "twig/twig:~1.0"
wget https://gist.githubusercontent.com/joelpittet/c5a20ddd1621e4d07e88/raw/10181c75b830510fa6d4f0f73e2ec77dd32fd34a/index.php

Then visit http://localhost/magic
https://gist.github.com/c5a20ddd1621e4d07e88

So I personally recommend the calls without the method calls, though #13 will technically work and is fine:)

Long story short, #13 is good as-is and should work beautifully though I'd prefer the slightly simpler syntax.