类型错误:参数 1 传递了 Chat::__construc t() 必须是 DoctrineORMEntity

Question

我使用棘轮和symfony 2.8在Web套接字应用程序上工作，以连接到数据库，如果有人连接到服务器，则会更改某个列中的值，所以我应该注入服务并添加EntityManager $em像这样function __construct()，但问题是当我像这样Chat.php文件上添加它时

public function __construct(EntityManager $em) 

我收到此错误

  [SymfonyComponentDebugExceptionFatalThrowableError]                      
  Type error: Argument 1 passed Chat::__construc t() must be an instance of DoctrineORMEntityManager, none given, called in SocketCommand.php on line 41 

此错误告诉我此行的文件SocketCommand.php有问题

new Chat()

聊天.php文件

<?php
namespace checkroomsBundleSockets;
use tutotestBundleEntityUsers;
use SymfonyBundleFrameworkBundleControllerController;
use SymfonyComponentHttpFoundationRequest;
use RatchetMessageComponentInterface;
use RatchetConnectionInterface;
use SymfonyComponentDependencyInjectionContainerInterface;
use DoctrineORMEntityManager;
class Chat implements MessageComponentInterface  {
    //private $container;
    protected $clients;
    protected $em;
    //protected $db;
    public function __construct(EntityManager $em) {
        $this->clients = new SplObjectStorage;
        //$this->container = $container;
        $this->em = $em;
    }
    public function onOpen(ConnectionInterface $conn) {
        $this->clients->attach($conn);
        echo "New connection! ({$conn->resourceId})n";
        //$this->em->getRepository('yorrepo')->updateFuntion();
        $sql = $this->container->get('database_connection');
        $users = $sql->query("UPDATE user SET ONoroff= '1999' WHERE UserId='2'");

    }
}

套接字命令.php代码

<?php
// myapplication/src/sandboxBundle/Command/SocketCommand.php
// Change the namespace according to your bundle
namespace checkroomsBundleCommand;
use SymfonyComponentConsoleCommandCommand;
use SymfonyComponentConsoleInputInputInterface;
use SymfonyComponentConsoleOutputOutputInterface;
// Include ratchet libs
use RatchetServerIoServer;
use RatchetHttpHttpServer;
use RatchetWebSocketWsServer;
// Change the namespace according to your bundle
use checkroomsBundleSocketsChat;
class SocketCommand extends Command
{
    protected function configure()
    {
        $this->setName('sockets:start-chat')
            // the short description shown while running "php bin/console list"
            ->setHelp("Starts the chat socket demo")
            // the full command description shown when running the command with
            ->setDescription('Starts the chat socket demo')
        ;
    }
    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $output->writeln([
            'Chat socket',// A line
            '============',// Another line
            'Starting chat, open your browser.',// Empty line
        ]);
        $server = IoServer::factory(
            new HttpServer(
                new WsServer(
                    new Chat()
                )
            ),
            8080
        );
        $server->run();
    }
}

Answer 1

发生此错误是因为您已将构造函数定义为：

public function __construct(EntityManager $em) {
    $this->clients = new SplObjectStorage;
    //$this->container = $container;
    $this->em = $em;
}

因此，您需要获得如下所示的实体管理器：

$em = $this->getDoctrine()->getManager();

然后在创建新对象时将其传入，如下所示：

new Chat( $em )

所以你需要弄清楚如何做到这一点。