Zend Framework 2：将变量传递给 View Helper

Question

我创建了一个 View Helper 来显示来自数据库表的最新广告。由于我有不同类型的广告，我希望能够从视图内部传递一个变量，在该视图中调用 View Helper 来显示特定的广告。

很抱歉我无法更好地解释它，但我仍然是 ZF2 的初学者。我将添加源代码，希望这会使它更清楚。请注意，我有一本书中的源代码，它随机显示了比萨饼并对其进行了更改，直到它可以显示我的广告。我可能仍然有实际上不需要的代码，所以请不要怀疑......好吧，代码在这里：

1.视图：index.html

<?php foreach ($this->latestAdvert() as $value){ ?>
      <li><?php echo $value->getAdvertTitle();?></li>
<?php }?>

2。视图助手：Advert\View\Helper\LatestAdvert.php

namespace Advert\View\Helper;
use Zend\View\Helper\AbstractHelper;

class LatestAdvert extends AbstractHelper
{

   protected $random = null;


   public function __construct($random)
   {
     $this->setLatestAdvert($random);
   }


   public function setLatestAdvert($random)
   {
     $this->random = $random;
   }


   public function getLatestAdvert()
   {
     return $this->random;
   }


   public function __invoke()
   {
     $latestAdverts = $this->getLatestAdvert();
     return $latestAdverts;
   }
}

3.工厂：Advert\View\Helper\LatestAdvertFactory.php

namespace Advert\View\Helper;

use Zend\ServiceManager\FactoryInterface;
use Zend\ServiceManager\ServiceLocatorInterface;

class LatestAdvertFactory implements FactoryInterface
{

    public function createService(ServiceLocatorInterface $serviceLocator) 
    {
      $locator = $serviceLocator->getServiceLocator();
      $service = $locator->get('Advert\Service');
      $random  = $service->fetchSingleByRandom();
      $helper  = new LatestAdvert($random);

      return $helper;
    }
}

4.服务： Advert\Service\LatestAdvertService .php

namespace Advert\Service;

use Advert\Entity\Advert as AdvertEntity;
use Doctrine\ORM\EntityManager;
use Zend\ServiceManager\ServiceManager;
use Zend\ServiceManager\ServiceManagerAwareInterface;
use Zend\Debug\Debug;

class LatestAdvertService implements ServiceManagerAwareInterface
{

  /**
   * Service manager.
   * @var Zend\ServiceManager\ServiceManager
   */
   private $serviceManager = null;

  /**
   * Sets service manager.
   * @param Zend\ServiceManager\ServiceManager $serviceManager Service manager.
   */
  public function setServiceManager(ServiceManager $serviceManager)
  {
    $this->serviceManager = $serviceManager;
  }

  /**
   * Returns service manager.
   * @return type
   */
  public function getServiceLocator()
  {
    return $this->serviceManager;
  }


  public function fetchSingleByRandom()
  {     
    // Get Doctrine entity manager.
    $entityManager =  $this->getServiceLocator()
                           ->get('doctrine.entitymanager.orm_default');
    $advertType = 'wanted'; // This should be removed
    $random = $entityManager->getRepository('Advert\Entity\Advert')
                            ->findAdvertsByDate($advertType);

    return $random; 
  }
}

5.模块：Advert\Module.php

public function getServiceConfig()
{
    return array(
        'invokables' => array(
                 'Advert\Service' => 'Advert\Service\LatestAdvertService',
                    ),
    );
}

public function getViewHelperConfig()
{
    return array(
        'factories' => array(           
            'latestAdvert' => 'Advert\View\Helper\LatestAdvertFactory',
        ),

    );
}

正如您在 #4 中看到的，我有一个名为 $advertType 的变量。当我在 index.html 中调用视图助手时，我想设置变量，f.e. $this->latestAdvert('wanted')，但是我怎样才能通过我的所有文件传递这个变量呢？我只是找不到解决方案。有没有人告诉我如何实现它？非常感谢您提前。

！更新！

正如 SenseException 在下面指出的，将服务定位器注入服务是一种不好的做法，相反我应该将存储库或实体管理器注入服务，我现在已经为实体管理器制定了第一个可行的解决方案。

为此我更新了 2 个文件：module.php 和 LatestAdvertService.php

#5 模块.php

public function getServiceConfig()
{
    return array(
            'factories' => array(

                    'Advert\Service' => function ($sl) {
                        $entityManager =   $sl->get('doctrine.entitymanager.orm_default');
                        $myService = new Service\LatestAdvertService();
                        $myService->setEntityManager($entityManager);
                        //or you can set repository
                        //$repository = $entityManager->getRepository('Advert\Entity\Advert');
                        //$myService->setRepository($repository);
                        return $myService;
                    },

4.服务： Advert\Service\LatestAdvertService .php

namespace Advert\Service;

use Advert\Entity\Advert as AdvertEntity;
use Doctrine\ORM\EntityManager;

class LatestAdvertService 
{


  public function setEntityManager(EntityManager $entityManager)
  {
    $this->entityManager = $entityManager;
  }

  public function setRepository(Repository $repository) {
   $this->repository = $repository;
  }


  public function fetchSingleByAdvertType($advertType)
  {

    $random = $this->entityManager->getRepository('Advert\Entity\Advert')->findAdvertsByDate($advertType);  
//  $random = $this->repository->findAdvertsByDate($advertType);

    return $random;
  }
}

我尝试注入存储库，但收到以下错误消息：

传递给 Advert\Service\LatestAdvertService::setRepository() 的参数 1 必须是 Advert\Service\AdvertRepository 的实例，给定的 Advert\Repository\AdvertRepository 的实例，在

我会继续寻找存储库注入的解决方案，成功后更新。

Answer 1

这个解决方案怎么样：

namespace Advert\View\Helper;

use Zend\ServiceManager\FactoryInterface;
use Zend\ServiceManager\ServiceLocatorInterface;

class LatestAdvertFactory implements FactoryInterface
{

    public function createService(ServiceLocatorInterface $serviceLocator) 
    {
      $locator = $serviceLocator->getServiceLocator();
      $service = $locator->get('Advert\Service');
      $helper  = new LatestAdvert($service);

      return $helper;
    }
}

当然还有助手类：

namespace Advert\View\Helper;
use Zend\View\Helper\AbstractHelper;

class LatestAdvert extends AbstractHelper
{

   protected $service;


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

   public function __invoke($advertType)
   {
       $latestAdverts = $this->service->fetchSingleByAdvertType($advertType);
       return $latestAdverts;
   }
}

对于服务：

public function fetchSingleByAdvertType($advertType)
{
    $entityManager =  $this->getServiceLocator()
                           ->get('doctrine.entitymanager.orm_default');

    $random = $entityManager->getRepository('Advert\Entity\Advert')
                            ->findAdvertsByDate($advertType);

    return $random; 
}

我试图让您的代码尽可能接近您的原始代码，但请听听有关服务定位器的一些建议。像在 LatestAdvertService 中那样将服务定位器注入服务是一种不好的做法。由于您的服务只需要一个存储库，因此只需将其注入其中。如果您的服务中需要实体管理器，请改为注入它。你的单元测试会感谢你的。