Symfony 如何使用 PHP 和 twig 创建可重用的小部件

Question

假设我在网站上不止一处有评论。我怎样才能创建类似的东西
{{ render_widget('comments', {"object": object} ) }} ?这将呈现带有该对象的所有注释的表单和列表？

Answer 1

创建服务:

// src/Acme/HelloBundle/Service/Widget.php
namespace Acme\HelloBundle\Service;

use Symfony\Component\DependencyInjection\ContainerInterface;

class Widget
{
    protected $container;

    public function __construct(ContainerInterface $container)
    {
        $this->container = $container;
    }

    public function getComments()
    {
        $request = $this->container->get('request'); // use service_container to access request, doctrine, twig, etc...
    }
}

声明一个服务:

# src/Acme/HelloBundle/Resources/config/services.yml
parameters:
    # ...
    my_widget.class: Acme\HelloBundle\Service\Widget

services:
    my_widget:
        class:     "%my_widget.class%"
        arguments: ["@service_container"]
        # scope: container can be omitted as it is the default

在 Controller 中使用服务:

namespace Acme\HelloBundle\Controller;

class BlogController {

    public function getPostAction($id) {
        // get post from db
        $widget = $this->get('my_widget'); // get your widget in controller
        $comments = $widget->getComments(); // do something with comments

        return $this->render('AcmeHelloBundle:Blog:index.html.twig',
            array('widget' => $widget) // pass widget to twig
        );
    }
}

或者在 Twig 中，如果您在 render() 中像上面那样在模板中传递您的服务功能:

#AcmeHelloBundle:Blog:index.html.twig

{{ widget.getComments()|raw }}

阅读有关 How to work with Scopes 的文档很有用