__construct（）必须学说\ COMMON \持久性\实例的ObjectManager

Question

我用Objectmanger的使用原则。我创建的ObjectManager的实例，并创建服务，但我有这样的错误：

Catchable Fatal Error: Argument 1 passed to Tag\TagBundle\Form\Types\TagsType::__construct() must be an instance of Doctrine\Common\Persistance\ObjectManager, instance of Doctrine\ORM\EntityManager given, called in /var/www/html/TagProject/var/cache/dev/appDevDebugProjectContainer.php on line 2412 and defined

代码TagsType ：

<?php 

    namespace Tag\TagBundle\Form\Types; 

    use Symfony\Component\Form\AbstractType; 
    use Symfony\Component\Form\Extension\Core\Type\TextType; 
    use Tag\TagBundle\Form\DataTransformer\TagsTransformer; 
    use Symfony\Bridge\Doctrine\Form\DataTransformer\CollectionToArrayTransformer; 
    use Symfony\Component\Form\FormBuilderInterface; 
    use Doctrine\Common\Persistance\ObjectManager; 

    class TagsType extends AbstractType { 

    /** 
    * @var ObjectManager 
    */ 

    private $manager; 

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

     public function buildForm(FormBuilderInterface $builder, array $options){ 
      $builder 
        ->addModelTransformer(new CollectionToArrayTransformer(),true) 
        ->addModelTransformer(new TagsTransformer($this->manager),true); 
     } 

     public function getParent(){ 
      return TextType::class; 
     } 

    } 

代码TagsTransformer：

<?php 

      namespace Tag\TagBundle\Form\DataTransformer; 

      use Symfony\Component\Form\DataTransformerInterface; 
      use Tag\TagBundle\Entity\Tag; 
      use Doctrine\Common\Persistance\ObjectManager; 

      class TagsTransformer implements DataTransformerInterface { 


      /** 
      * @var ObjectManager 
      */ 

      private $manager; 

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

      public function transform($value) { 
       dump($value); 
       return implode(',',$value); 
      } 

       public function reverseTransform($string) 
       { 
        $names = explode(',',$string); 
        $tags = $this->manager->getRepository('TagBundle:Tag')->findBy(['name' => $names]); 
        $newNames = array_diff($names, $tags); 
        foreach($names as $name){ 
         $tag = new tag(); 
         $tag->setName($name); 
         $tags[] = $tag; 
        } 
        return $tags; 
       } 
      } 

代码services.yml：

services: 
    tag.form.types.tages: 
    class: Tag\TagBundle\Form\Types\TagsType 
    arguments: ["@doctrine.orm.entity_manager"] 
    tags: 
     - { name: form.type } 
# tag.example: 
#  class: Tag\TagBundle\Example 
#  arguments: ["@service_id", "plain_value", "%parameter%"] 

Answer 1

你注射的EntityManager一个实例，所以你应该使用相应的接口Doctrine\ORM\EntityManagerInterface为typehinting。

use Doctrine\ORM\EntityManagerInterface; 

class TagsTransformer implements DataTransformerInterface 
{ 
    /** 
    * @var EntityManagerInterface 
    */ 
    private $manager; 

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