Symfony - 在EventSubscriber中注入实体经理

问题描述

这是我第一次使用表单的EventListener，所以我正在努力如何在其中注入EntityManager。

我有这个formType称为 UserType ，在这个类中，我有一个EventSubscriber AddDepartmentDegreeCourseFieldSubscriber 需要访问EntityManager

  class UserType extends AbstractType 
 {
 / ** 
 * @param FormBuilderInterface $ builder 
 * @param array $ options 
 * / 
 public function buildForm（FormBuilderInterface $ builder，array $ options）
 {
 $ builder-> addEventSubscriber（new AddProfileFieldSubscriber（））; 
 $ builder-> addEventSubscriber（new AddDepartmentDegreeCourseFieldSubscriber（））; 
} 
 
 / ** 
 * @param OptionsResolver $ resolver 
 * / 
 public function configureOptions（OptionsResolver $ resolver）
 {
 $ resolver-> setDefaults（array（
'data_class'=>'AppBundle\Entity\User'
））; 
} 
} 
  

这是我的服务。 yml

  app.department_course_degree_subscriber：
 class：AppBundle\Form\EventListener\\ \\AddDepartmentDegreeCourseFieldSubscriber 
 arguments：[@ doctrine.orm.entity_manager] 
标签：
  -  {name：kernel.event_subscriber} 
  

我得到的错误如下

我在...之间的shairyar / Sites / oxford-portal / src / AppBundle / Form / UserType.php
知道错误是什么意思，但我认为我在 services.yml 中注册的服务应该注入 EntityManager 所以为什么我得到这个错误？我在这里失踪了任何帮助将非常感激。

解决方案

这是因为，您传递新的实例AddDepartmentDegreeCourseFieldSubscriber 建筑形式。您需要从服务容器传递实例。

 使用AppBundle\Form\EventListener\ AddDepartmentDegreeCourseFieldSubscriber; 
 
 class UserType extends AbstractType 
 {
 private $ addDepartmentDegreeCourseFieldSubscriber; 
 
 public function __construct（AddDepartmentDegreeCourseFieldSubscriber $ subscriber）
 {
 $ this-> addDepartmentDegreeCourseFieldSubscriber = $ subscriber; 
} 
 
 / ** 
 * @param FormBuilderInterface $ builder 
 * @param数组$ options 
 * / 
 public function buildForm FormBuilderInterface $ builder，array $ options）
 {
 $ builder-> addEventSubscriber（$ this-> addDepartmentDegreeCourseFieldSubscriber）; 
} 
} 
  

 ＃app / config / services.yml 
 services：
 app.department_course_degree_subscriber：
 class：AppBundle\Form\EventListener\AddDepartmentDegreeCourseFieldSubscriber 
 arguments：[ @ doctrine.orm.entity_manager] 
标签：
  -  {name：kernel.event_subscriber} 
 
 app.form.type.my_user_form：
 class：AppBundle \Form\UserType 
参数：[@ app.department_course_degree_subscriber] 
标签：
  -  {name：form.type} 
  / pre> 
This is the first time I am working with EventListener of a form so I am struggling on how to inject EntityManager in it.

I have this formType called UserType and in this class I have an EventSubscriber AddDepartmentDegreeCourseFieldSubscriber which needs access to EntityManager
class UserType extends AbstractType
{
    /**
     * @param FormBuilderInterface $builder
     * @param array $options
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->addEventSubscriber(new AddProfileFieldSubscriber());
        $builder->addEventSubscriber(new AddDepartmentDegreeCourseFieldSubscriber());
    }

    /**
     * @param OptionsResolver $resolver
     */
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'AppBundle\Entity\User'
        ));
    }
}
This is my services.yml
app.department_course_degree_subscriber:
    class: AppBundle\Form\EventListener\AddDepartmentDegreeCourseFieldSubscriber
    arguments: ["@doctrine.orm.entity_manager"]
    tags:
        - { name: kernel.event_subscriber }
The error I get is as following
I know what the error means but I thought the service i registered in services.yml should inject the EntityManager so why I am getting this error? What am i missing here? Any help will be really appreciated.
 解决方案 
It's because, you pass new instance of AddDepartmentDegreeCourseFieldSubscriber when building form. You need to pass instance from service container.
use AppBundle\Form\EventListener\AddDepartmentDegreeCourseFieldSubscriber;

class UserType extends AbstractType
{
    private $addDepartmentDegreeCourseFieldSubscriber;

    public function __construct(AddDepartmentDegreeCourseFieldSubscriber $subscriber)
    {
        $this->addDepartmentDegreeCourseFieldSubscriber = $subscriber;
    }

    /**
     * @param FormBuilderInterface $builder
     * @param array $options
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->addEventSubscriber($this->addDepartmentDegreeCourseFieldSubscriber);
    }
}
# app/config/services.yml
services:
    app.department_course_degree_subscriber:
        class: AppBundle\Form\EventListener\AddDepartmentDegreeCourseFieldSubscriber
        arguments: ["@doctrine.orm.entity_manager"]
        tags:
            - { name: kernel.event_subscriber }

    app.form.type.my_user_form:
        class: AppBundle\Form\UserType
        arguments: [ "@app.department_course_degree_subscriber" ]
        tags:
            - { name: form.type }
                        
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