未创建服务异常：ZF2

Question

我正在完成面向初学者的 ZF2 深入教程，但在重新加载页面时我不断收到以下错误消息：

"执行过程中出现错误，请稍后重试。

附加信息：

Zend\ServiceManager\Exception\ServiceNotCreatedException File:C:\xampp\htdocs\zend\vendor\zendframework\zendframework\library\Zend\ServiceManager\ServiceManager.php:946 Message:An 创建时出现异常 "Blog\Controller\List"；没有实例 returned".

我已经到了准备数据库、添加映射器实现并更改 module.config.php 文件中的控制器管理器以便它支持工厂的教程阶段。我似乎无法发现问题所在。我的代码摘录如下：

module.config.php:

  // Tells our module where to find the view files. Can also overwrite view files for other modules.
  'view_manager' => array(
     'template_path_stack' => array(
         __DIR__ . '/../view'
         ),
     ),
           // Tells our module where to find the controller named Blog\Controller\List

  'controllers' => array(
     'factories' => array(
        'Blog\Controller\List' => 'Blog\Factory\ListControllerFactory'
         )
     ),

ListController.php:

    <?php
 // Filename: /module/Blog/src/Blog/Controller/ListController.php
 namespace Blog\Controller;

 use Blog\Service\PostServiceInterface;
 use Zend\Mvc\Controller\AbstractActionController;

 class ListController extends AbstractActionController
 {
     /**
      * @var \Blog\Service\PostServiceInterface
      */
     protected $postService;

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

    public function indexAction()
    {
        return new ViewModel(array(
            'posts' => $this->postService->findAllPosts()
            ));
    }

}

?>

ListControllerFactory.php

    <?php

namespace Blog\Factory;

use Blog\Controller\ListController;
use Zend\ServiceManager\FactoryInterface;
use Zend\ServiceManager\ServiceLocatorInterface;

class ListControllerFactory implements FactoryInterface
{
     /**
      * Create service
      *
      * @param ServiceLocatorInterface $serviceLocator
      *
      * @return mixed
      */

     public function createService(ServiceLocatorInterface $serviceLocator)
     {
        $realServiceLocator = $serviceLocator->getServiceLocator();
        $postService = $realServiceLocator->get('Blog\Service\PostServiceInterface');

          return new ListController($postService);
     }
}

ZendDBSQLMapper.php - 设计为映射器 class 以执行对现有数据库的调用：

<?php
// Filename: /module/Blog/src/Blog/Mapper/ZendDbSqlMapper.php


namespace Blog\Mapper;

use Blog\Model\PostInterface;
use Zend\Db\Adapter\AdapterInterface;

class ZendDbSqlMapper implements PostMapperInterface
{
    /**
        * @var \Zend\Db\Adapter\AdapterInterface
    */

  protected $dbAdapter;

   /**
  * @param AdapterInterface  $dbAdapter
  */

   public function __constrcut(AdapterInterface $dbAdapter)
   {
        $this->dbAdapter = $dbAdapter;
   }

    /**
  * @param int|string $id
  *
  * @return PostInterface
  * @throws \InvalidArgumentException
  */

    public function find($id)
    {

    }

    /**
  * @return array|PostInterface[]
  */

    public function findAll()
    {
        $sql = new Sql($this->dbAdapter);
        $select = $sql->select('posts');

        $stmt = $sql->prepareStatementForSqlObject($select);
        $result = $stmt->execute();

        \Zend\Debug\Debug::dump($result);die();
    }

}

由于最后一行代码中有转储命令，结果变量的数据转储应该return类似：

    object(Zend\Db\Adapter\Driver\Pdo\Result)#303 (8) {
   ["statementMode":protected] => string(7) "forward"
   ["resource":protected] => object(PDOStatement)#296 (1) {
     ["queryString"] => string(29) "SELECT `posts`.* FROM `posts`"
   }
   ["options":protected] => NULL
   ["currentComplete":protected] => bool(false)
   ["currentData":protected] => NULL
   ["position":protected] => int(-1)
   ["generatedValue":protected] => string(1) "0"
   ["rowCount":protected] => NULL
 }

但是我得到了如上所述的错误页面。

Answer 1

我发现了问题。本教程缺少此部分。

教程只说：

As you know from previous chapters, whenever we have a required parameter we need to write a factory for the class. Go ahead and create a factory for our mapper implementation.

您需要为 ZendDbSqlMapper 创建一个工厂：创建/Blog/src/Blog/Factory/ZendDbSqlMapperFactory.php

<?php
// Filename: /Blog/src/Blog/Factory/ZendDbSqlMapperFactory.php
namespace Blog\Factory;

use Blog\Mapper\ZendDbSqlMapper;
use Zend\ServiceManager\FactoryInterface;
use Zend\ServiceManager\ServiceLocatorInterface;

class ZendDbSqlMapperFactory implements FactoryInterface
{
    /**
    * Create service
    *
    * @param ServiceLocatorInterface $serviceLocator
    *
    * @return mixed
    */
    public function createService(ServiceLocatorInterface $serviceLocator)
    {
        return new ZendDbSqlMapper($serviceLocator->get('Zend\Db\Adapter\Adapter'));
    }
}

Answer 2

**and also use this one :**

'service_manager' => array(
    'factories' => array(
        'Blog\Mapper\PostMapperInterface'   => 'Blog\Factory\ZendDbSqlMapperFactory',
        'Blog\Service\PostServiceInterface' => 'Blog\Factory\PostServiceFactory',
        'Zend\Db\Adapter\Adapter'           => 'Zend\Db\Adapter\AdapterServiceFactory',
    )

Answer 3

@kiwi Juicer 首先指出教程有两个问题。ZendDbSqlMapperFactory.php 缺失。

创建文件：/Blog/src/Blog/Factory/ZendDbSqlMapperFactory.php并填写以下内容：

    <?php// Filename: /module/Blog/src/Blog/Factory/ZendDbSqlMapperFactory.php

namespace Blog\Factory;

 use Blog\Mapper\ZendDbSqlMapper;
 use Blog\Model\Post;
 use Zend\ServiceManager\FactoryInterface;
 use Zend\ServiceManager\ServiceLocatorInterface;
 use Zend\Stdlib\Hydrator\ClassMethods;

 class ZendDbSqlMapperFactory implements FactoryInterface
 {
     /**
      * Create service
      *
      * @param ServiceLocatorInterface $serviceLocator
      *
      * @return mixed
      */
     public function createService(ServiceLocatorInterface $serviceLocator)
     {
         return new ZendDbSqlMapper(
             $serviceLocator->get('Zend\Db\Adapter\Adapter'),
             new ClassMethods(false),
             new Post()
         );
     }
 }

然后打开module/Blog/conf/blog.conf.php

在原来的博客中。conf.php他们在分配 PostServiceFactory 的无效路径时遇到问题

'Blog\Service\PostServiceInterface' => 'Blog\Service\Factory\PostServiceFactory',

找到并用正确的路径替换上面的行：

'Blog\Service\PostServiceInterface' => 'Blog\Factory\PostServiceFactory',

未创建服务异常：ZF2

Service Not Created Exception: ZF2

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