Is it good practice to embed Edge Side Includes in my templates?

Question

In our Symfony2 application, we make reusable blocks with render_esi. We have such templates:

{% for products as product %}
<div class="product">
    <h4>{{ product.name }}</h4>
    <div class="ratings">
    {{ render_esi(controller('AcmeDemoCommunityBundle:Rating:ratingStars', {
        objectType: 'product',
        objectId: product.id,
        readOnly: true
    })) }}
    </div>
</div>
{% endfor %}

And for this reason, we use render_esi also on the product details page.

Answer 1

I would like to distinguish between different types of blocks:

• Blocks that perform other actions of the same controller.
• Blocks that can be used in other parts of the application.

What is the difference?

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ESI ( usecase), Twig. Twig AcmeDemoCommunityBundle.

namespace Acme\DemoCommunityBundle\Twig;

use Symfony\Component\HttpKernel\Fragment\FragmentHandler;
use Symfony\Component\HttpKernel\Controller\ControllerReference;
use Acme\DemoCommunityBundle\Rating\RateableInterface;

class CommunityExtension extends \Twig_Extension
{
    /**
     * @var string
     */
    const RATING_ACTION = 'AcmeDemoCommunityBundle:Rating:ratingStars';

    /**
     * @var FragmentHandler
     */
    protected $handler;

    public function __construct(FragmentHandler $handler)
    {
        $this->handler = $handler;
    }

    public function getFunctions()
    {
        return array(
            'community_rating' => new \Twig_Function_Method($this, 'communityRating', array('is_safe' => array('html'))),
        );
    }

    public function communityRating(RateableInterface $object, $readOnly = false)
    {
        return $this->handler->render(new ControllerReference(self::RATING_ACTION, array(
            'objectType' => $object->getRatingType(),
            'objectId' => $object->getId(),
            'readOnly' => $readOnly
        )), 'esi', $options);
    }

    public function getName()
    {
        return 'community';
    }
}

services:
    acme_community.twig.community:
        class:     Acme\DemoCommunityBundle\Twig\CommunityExtension
        arguments: [ @fragment.handler ]
        tags:
            - { name: twig.extension }

:

{% for products as product %}
<div class="product">
    <h4>{{ product.name }}</h4>
    <div class="ratings">
    {{ community_rating(product, true) }}
    </div>
</div>
{% endfor %}

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