Symfony One To Many不连接父母

Question

我有一个包含3个实体的测验结构:

• 测验有问题(OneToMany)
• 问题有测验(ManyToOne)
• 问题有答案(OneToMany)
• 答案有疑问(ManyToOne)

代码看起来像这样:

测验实体

class Quiz
{    
    /**
     * @ORM\OneToMany(targetEntity="Question", mappedBy="quiz", cascade={"persist", "remove"})
     */
    private $questions;

    public function __construct() {
        $this->questions = new ArrayCollection();
    }

    public function addQuestion(\Cariboo\QuizBundle\Entity\Question $questions)
    {
        $questions->setQuiz( $this );
        // die(); Not dying here...
        $this->questions[] = $questions;

        return $this;
    }

    public function removeQuestion(\Cariboo\QuizBundle\Entity\Question $questions)
    {
        $this->questions->removeElement($questions);
    }

    public function getQuestions()
    {
        return $this->questions;
    }
}

问题实体

class Question
{
    /**
     * @ORM\OneToMany(targetEntity="Answer", mappedBy="question", cascade={"persist", "remove"})
     */
    private $answers;

    /**
     * @ORM\ManyToOne(targetEntity="Cariboo\QuizBundle\Entity\Quiz", cascade={"persist"})
     */
    private $quiz;

    public function addAnswer(\Cariboo\QuizBundle\Entity\Answer $answers)
    {
        $answers->setQuestion( $this );
        $this->answers[] = $answers;

        return $this;
    }

    public function removeAnswer(\Cariboo\QuizBundle\Entity\Answer $answers)
    {
        $this->answers->removeElement($answers);
    }

    public function getAnswers()
    {
        return $this->answers;
    }

    public function setQuiz(\Cariboo\QuizBundle\Entity\Quiz $quiz = null)
    {
        $this->quiz = $quiz;

        return $this;
    }

    public function getQuiz()
    {
        return $this->quiz;
    }
}

回答实体

class Answer
{
    /**
     * @ORM\ManyToOne(targetEntity="Cariboo\QuizBundle\Entity\Question")
     */
    private $question;

    public function setQuestion(\Cariboo\QuizBundle\Entity\Question $question = null)
    {
        $this->question = $question;

        return $this;
    }

    public function getQuestion()
    {
        return $this->question;
    }
}

我级联坚持他们.

我按照Cascaded persist not working(Doctrine ORM + Symfony 2)中的说明配置了我的setter

执行addAnswer并获得答案,问题设置正确.但是addQuestion没有设置测验.

发送表格时被甩掉的图像

我可以foreach在我的控制器中添加一个,但我对此不满意,因为我觉得我没有利用symfony的力量.(没有重复的实体没有正确关联)

    if ( $form->isValid() ) {
        foreach ( $quiz->getQuestions() as $question ) {
            $question->setQuiz( $quiz );
        }
        $em = $this->getDoctrine()->getManager();
        $em->persist( $quiz );
        $em->flush();

        return $this->redirect( $this->generateUrl( 'quiz_show', array(
            'slug' => $quiz->getSlug()
        ) ) );
    }

我无法弄清楚为什么addQuestion不执行.

编辑

我的Quiz表格

    $builder
        ->add( 'questions', 'collection', array(
            'type' => new QuestionType(),
            'allow_add' => true,
            'allow_delete' => true,
            'prototype' => true,
            'prototype_name' => '__qst_prot__'
        ) )
    ;

部分建设者 Question

    $builder
        ->add( 'question', 'text' )
        ->add( 'answers', 'collection', array(
            'type' => new AnswerType(),
            'allow_add' => true,
            'allow_delete' => true,
            'prototype' => true,
            'prototype_name' => '__asw_prot__'
        ) );

我的 Answer form

$builder
        ->add( 'answer', 'text' )
        ->add( 'correct' )
    ;

Answer 1

问题出在collection表单类型上。如果要调用父实体setter，则需要设置by_reference为。false

Symfony 文档：

Similarly, if you're using the CollectionType field where your underlying collection data is an object (like with Doctrine's ArrayCollection), then by_reference must be set to false if you need the adder and remover (e.g. addAuthor() and removeAuthor()) to be called.

在这里阅读更多信息：http://symfony.com/doc/current/reference/forms/types/collection.html#by-reference