必须避免如何避免传递给选择字段的实体.也许将它们保留在实体管理器中?" [英] How to avoid "Entities passed to the choice field must be managed. Maybe persist them in the entity manager?"

问题描述

1. 从现有数据库生成的实体
2. 生成的CRUD 控制器

1. Generated Entities from existing database
2. Generated CRUD controller

但是它不适用于异常消息:

But it does not work with exception message:

必须管理传递给选择字段的实体.也许将它们保留在实体经理中?

Entities passed to the choice field must be managed. Maybe persist them in the entity manager?

实体

/**
 * Question
 *
 * @ORM\Table(name="question", indexes={@ORM\Index(name="question_category_id", columns={"question_category_id"})})
 * @ORM\Entity
 */
class Question
{
    //...

    /**
     * @var \AppBundle\Entity\QuestionCategory
     * @ORM\ManyToOne(targetEntity="AppBundle\Entity\QuestionCategory")
     * @ORM\JoinColumns({
     *   @ORM\JoinColumn(name="question_category_id", referencedColumnName="id")
     * })
     */
    private $questionCategory;

    public function __construct() 
    {
        $this->questionCategory = new QuestionCategory();
    }

    //...
}

表格

class QuestionType extends AbstractType
{
    /**
     * @param FormBuilderInterface $builder
     * @param array $options
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('name')
            ->add('questionCategory');
    }

    /**
     * @param OptionsResolver $resolver
     */
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'AppBundle\Entity\Question'
        ));
    }
}

控制器

class QuestionController extends Controller
{
   //...

   /**
     * Creates a new Question entity.
     * @Route("/new", name="question_new")
     * @Method({"GET", "POST"})
     */
    public function newAction(Request $request)
    {
        $question = new Question();
        $form = $this->createForm('AppBundle\Form\QuestionType', $question);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            $em = $this->getDoctrine()->getManager();
            $em->persist($question);
            $em->flush();

            return $this->redirectToRoute('question_show', array('id' => $question->getId()));
        }

        return $this->render('question/new.html.twig', array(
            'question' => $question,
            'form' => $form->createView(),
        ));
    }

//...
}

深度调试无济于事.如何解决?

Deep debugging gives nothing to me. How to fix it?

测试存储库以重现错误: https://github.com/sectus/question.test .local

Test repository to reproduce error: https://github.com/sectus/question.test.local

推荐答案

根据GitHub项目上显示的代码，Question实体具有以下构造函数:

According to the code shown on your GitHub project, the Question entity has the following constructor:

public function __construct() 
{
    $this->questionCategory = new QuestionCategory();
}

创建entity表单字段时，该字段只能包含由准则管理的值，而新的questionCategory不受管理.

When you create an entity form field, it can only contain values that are managed by doctrine, but your new questionCategory is not managed.

通常，最佳解决方案是仅在构造函数中不填充此实体字段，而仅在您严格需要的地方.构建表单时，Synfony将在提交并调用$form->handleRequest()之后为您填充表单.

Usually, the best solution is just to not fill this entity field in the constructor, but only in those places you strictly need it. When building a form, Synfony will fill it for you after submitting and calling $form->handleRequest().

因此，在您的情况下，只需删除Question实体的构造函数.

So, in your case, just remove the Question entity's constructor.

之后，您还需要在QuestionCategory实体中实现__toString()方法:

After that, you'll also need to implement the __toString() method in QuestionCategory entity:

 public function __toString(){
       return 'whatever you neet to see the type`;
 }

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