Symfony2 Collections.控制器中的关系

所以，我有3个实体。所有这些都是相关的，就像它显示在图片

我在控制器中有这个代码

/**
* 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,
    ));
}

然后我正在尝试在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="answerswer" value="{{ answer.answer }}">{{ answer.answer }}</input><br>
            {% endfor %}
            </form>
            {% endif %}
            {% if question.toa == 'check' %}
            <form>
            {% for answer in answers %}
            <input type="checkbox" name="answerswer{{ 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="answerswer{{ answer.id }}"><br>
            {% endfor %}
            </form>
            {% endif %}
        </li>
    {% endfor %}
</ul>

所以，我希望得到这样的东西：

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

但我得到了这个

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

如何根据答案相关的question_id显示答案？我还试图呼吁question_id并尝试在我的树枝模板中做出 if 语句。就像如果 question.id==answer.question_id然后显示答案。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="answerswers")
 * @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，我试着比较 question.id 并回答问题。但它说

在第 16 行的 TestprojectTestManagerBundle：Test：show.html.twig 中呈现模板（"注意：类 Testproject''TestManagerBundle''Entity''Question 的对象无法转换为 int"）时引发了异常。

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

有人有什么想法吗？谢谢。附言对不起我的英语。