symfony 发生错误：注意：未定义的属性：::$container

Question

如果有人连接到服务器，我正在使用棘轮和 symfony 2.8 连接到数据库并更改特定列中的值的 Web 套接字应用程序，但我在这一行中遇到错误

    $sql = $this->container->get('database_connection');

完整的错误信息

发生错误：注意：未定义属性：check\roomsBundle\Sockets\Chat::$container

我在 services.yml 代码中的注入

services:
     database_connection:
         class: check\roomsBundle\Sockets\Chat
         arguments: ["@service_container"] 

我的 Chat.php 代码

<?php
namespace check\roomsBundle\Sockets;
use tuto\testBundle\Entity\Users;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;

use Ratchet\MessageComponentInterface;
use Ratchet\ConnectionInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

class Chat implements MessageComponentInterface  {


    protected $clients;
    //protected $db;
    public function __construct() {
        $this->clients = new \SplObjectStorage;
    }

    public function onOpen(ConnectionInterface $conn) {
        $this->clients->attach($conn);

        echo "New connection! ({$conn->resourceId})\n";

        $sql = $this->container->get('database_connection');
        $users = $sql->query("UPDATE user SET ONoff= '1' WHERE UserId='2'");


    }
}

Answer 1

好的，您需要解决一些问题才能解决您的问题。

services:
     database_connection:
         class: check\roomsBundle\Sockets\Chat
         arguments: ["@service_container"] 

这是在调用构造函数时，它将传入服务容器，但是使用构造函数传入你的容器是不利的，而是你应该实现Symfony\Component\DependencyInjection\ContainerAwareInterface接口，然后实现方法setContainer 和可选的getContainer 方法。

/**
 * @param ContainerInterface|NULL $container
 */
public function setContainer(
    ContainerInterface $container = NULL
)
{
    $this->container = $container;
    return $this;
}

/**
 * @return ContainerInterface
 */
protected function getContainer()
{
    return $this->container;
}

然后更新您的服务以在初始化时调用此方法。

services:
     chat_service: # renamed because this is your chat service, not your database connection
         class: check\roomsBundle\Sockets\Chat
         calls:
             - [setContainer, ["@service_container"]]

Answer 2

你的服务很好，你只需要对你的 chat.php 类做些小改动

use Symfony\Component\DependencyInjection\ContainerInterface as Container;

class Chat implements MessageComponentInterface  {

protected $clients;
private $container;
//protected $db;
public function __construct(Container $container) {
    $this->clients = new \SplObjectStorage;
    $this->container = $container;
}

现在你可以使用$this->container

更新

尝试注入实体管理器

services:
  database_connection:
    class: check\roomsBundle\Sockets\Chat
    arguments: 
        - @doctrine.orm.default_entity_manager

在chat.php中这样做

use Doctrine\ORM\EntityManager;
class Chat implements MessageComponentInterface  {

   protected $clients;
   protected $em;
   public function __construct(EntityManager $em) {
       $this->clients = new \SplObjectStorage;
       $this->em = $em;
   }
$this->em->getRepository('yorrepo')->updateFuntion();

现在尝试从某个 repo 调用来更新

Answer 3

注入服务容器一般认为是bad idea.

你应该考虑注入database_connection服务。

有几种方法可以做到这一点。看看Types of Injection.

services:
     chat_service:
         class: check\roomsBundle\Sockets\Chat
         arguments: ["@database_connection"]

你的班级

protected $connection;

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

即使你想继续注入服务容器，上面的链接也有相关的文档，可以帮助你解决你面临的问题。