Symfony2 集合。控制器中的关系

Question

所以，我有 3 个实体。所有都是相关的，就像它显示在 picture

我在控制器中有这段代码

/**
* After clicking the link at our index page we are getting to the show page
* where the user can pass the test
*/
public function showAction($id) 
{
    $em = $this->getDoctrine()->getManager();
    // Here we get out test's ID
    $test = $em->getRepository('TestprojectTestManagerBundle:Test')->find($id);
    // Then we get our questions information according to previously chosen test's ID 
    $questions = $em->getRepository('TestprojectTestManagerBundle:Question')->findBy(
        array('test'=>$test),
        array('question'=>'ASC')
        );
    // Here I tried to do the same with my answers, i.e. getting answers according to the current question
    // But faild. $questions is all questions of our test. So, we get all answers of all questions of our test.
    // Didn't figured out how to solve this.
    $answers = $em->getRepository('TestprojectTestManagerBundle:Answer')->findBy(
        array('questions'=>$questions),
        array('answer'=>'ASC')
        );
    return $this->render('TestprojectTestManagerBundle:Test:show.html.twig', array(
        'test'=>$test,
        'questions'=>$questions,
        'answers'=>$answers,

    ));
}

然后我尝试在 show.html.twig 中创建一个页面

<ul>
    {% for question in questions %}
        <li>
            <p>{{ question.question }}</p>
            {% if question.toa == 'select' %}

            <form>
            {% for answer in answers %}
            <input type="radio" name="answer" value="{{ answer.answer }}">{{ answer.answer }}</input><br>
            {% endfor %}
            </form>

            {% endif %}

            {% if question.toa == 'check' %}

            <form>
            {% for answer in answers %}
            <input type="checkbox" name="answer{{ answer.id }}" value="{{ answer.answer }}">{{ answer.answer }}</input><br>
            {% endfor %}
            </form>

            {% endif %}

            {% if question.toa == 'textfield' %}

            <form>
            {% for answer in answers %}
            <input type="text" name="answer{{ answer.id }}"><br>
            {% endfor %}
            </form>

            {% endif %}

        </li>
    {% endfor %}
</ul>

所以，我期待得到这样的东西：

Test1
 Question 1
  Q1.Answer 1
  Q1.Answer 2
 Question 2
  Q2.Answer 1
  Q2.Answer 2

但我明白了

Test1
 Question 1
  Q1.Answer 1
  Q1.Answer 2
  Q2.Answer 1
  Q2.Answer 2
 Question 2
  Q1.Answer 1
  Q1.Answer 2
  Q2.Answer 1
  Q2.Answer 2

如何根据相关的 question_id 显示我的答案？ 我还尝试调用 question_id 并尝试在我的 twig 模板中创建一个 if 语句。就像如果 question.id == answer.question_id 然后显示 answer.answer。但它没有用。它说 question_id 不存在。虽然它存在于我的数据库中！ 在我的实体中有：

//in answer entity
/**
 * @ORM\ManyToOne(targetEntity="Question", inversedBy="answers")
 * @ORM\JoinColumn(name="question_id", nullable=false, referencedColumnName="id")
 */
protected $questions;
//in question entity
/**
* @ORM\OneToMany(targetEntity="Answer", mappedBy="questions", cascade={"all"}, orphanRemoval=true)
*/
protected $answers;

所以，我尝试比较 question.id 和 answer.questions。但它说

在第 16 行的 TestprojectTestManagerBundle:Test:show.html.twig 中的模板呈现期间引发了异常（“注意：Testproject\TestManagerBundle\Entity\Question 类的对象无法转换为 int”）。

我也尝试了 {% if question.answers == answer.questions %}，它让渲染顺利进行，但它返回 false。

有人有什么想法吗？谢谢你。 附：对不起我的英语。

Answer 1

{% if question.id == answer.questions.id %}

你应该写

//in answer entity /** * @ORM\ManyToOne(targetEntity="Question", inversedBy="answers") * @ORM\JoinColumn(name="question_id", nullable=false, referencedColumnName="id") */ protected $question; // not questions because its ManyToOne

然后在模板中就变成了

{% if question.id == answer.question.id %}

Answer 2

通常，如果学说生成实体，它会删除下划线。您是否尝试过 question.id == answer.questionId？而且，问题与您数据库中的 question_id 无关。