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我正在尝试为动态表单执行以下过程：

  1. 用户选择学校
  2. 然后，我需要获取与该学校相关的所有“成绩”。

我试图用这种形式实现的是创建一个新的“班级”（如学校班级），它与成绩相关联。问题（我认为，正如您将在下面看到的那样）是 SchoolClass 对象不知道 School 对象，只知道 Grade 对象。我只会发布相关代码...

学校班级

/**
 * @ORM\OneToMany(targetEntity="Grade", mappedBy="school")
 */
private $grades;
public function __construct()
{
    $this->grades = new \Doctrine\Common\Collections\ArrayCollection();
}

/**
 * Add grades
 *
 * @param \MyBundle\MainBundle\Entity\Grade $grades
 * @return School
 */
public function addGrade(\MyBundle\MainBundle\Entity\Grade $grades)
{
    $this->grades[] = $grades;

    return $this;
}

/**
 * Remove grades
 *
 * @param \MyBundle\MainBundle\Entity\Grade $grades
 */
public function removeGrade(\MyBundle\MainBundle\Entity\Grade $grades)
{
    $this->grades->removeElement($grades);
}

/**
 * Get grades
 *
 * @return \Doctrine\Common\Collections\Collection 
 */
public function getGrades()
{
    return $this->grades;
}

年级班

/**
 * @var School
 *
 * @ORM\ManyToOne(targetEntity="School", inversedBy="grades")
 * @ORM\JoinColumn(name="school_id", referencedColumnName="id")
 */
private $school;

/**
 * @ORM\OneToMany(targetEntity="SchoolClass", mappedBy="grade")
 */
private $schoolClasses;

//Getters and setters for school come here, leaving them out as they are the usual...


/**
 * Constructor
 */
public function __construct()
{
    $this->schoolClasses = new \Doctrine\Common\Collections\ArrayCollection();
}

/**
 * Get schoolClasses
 *
 * @return \Doctrine\Common\Collections\Collection 
 */
public function getSchoolClasses()
{
    return $this->schoolClasses;
}

/**
 * Add schoolClasses
 *
 * @param \MyBundle\MainBundle\Entity\SchoolClass $schoolClasses
 * @return Grade
 */
public function addSchoolClasse(\MyBundle\MainBundle\Entity\SchoolClass $schoolClasses)
{
    $this->schoolClasses[] = $schoolClasses;

    return $this;
}
/**
 * Remove schoolClasses
 *
 * @param \MyBundle\MainBundle\Entity\SchoolClass $schoolClasses
 */
public function removeSchoolClasse(\MyBundle\MainBundle\Entity\SchoolClass $schoolClasses)
{
    $this->schoolClasses->removeElement($schoolClasses);
}

顺便说一句，removeSchoolClasse()和addSchoolClasse()函数是由Doctrine生成的，这是一个错误吗？

编辑 - 忘记添加 SchoolClass 类...

/**
 * @var Grade
 *
 * @ORM\ManyToOne(targetEntity="Grade", inversedBy="schoolClasses")
 * @ORM\JoinColumn(name="grade_id", referencedColumnName="id")
 */
private $grade;
/**
 * Set grade
 *
 * @param Grade $grade
 * @return SchoolClass
 */
public function setGrade($grade)
{
    $this->grade = $grade;

    return $this;
}

/**
 * Get gradeId
 *
 * @return integer
 */
public function getGrade()
{
    return $this->grade;
}

无论如何，我尝试按照 Symfony 文档上的教程进行操作，但没有奏效，所以我尝试了自己的表单事件实现，其中的重要部分在这里：

    $builder
            ->add('classDescription')
            ->add('school', 'entity', array(
                'class' => 'MyBundleMainBundle:School',
                'multiple' => false,
                'mapped' => false,
            ));

        //Add event listener for when user changes the school...
        $builder->addEventListener(
            FormEvents::PRE_SET_DATA,
            function(FormEvent $event) {
                $form = $event->getForm();
                //Here I tried my own implementation but obviously doesn't work as $school will be of type Form, am I correct?
                $school = $form->get('school');
                $grades = $school->getGrades();

                $form->add('grade', 'entity', array(
                    'choices' => $grades,
                ));
            }
        );

任何帮助将不胜感激！

4

1 回答 1

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表单事件不会在另一个字段的功能中填充字段，您必须使用 javascript 来执行此操作。

但是如果你想通过验证过程，你应该使用文档中描述的表单事件。

于 2013-11-09T23:12:44.867 回答