如何将实体映射到Symfony 2中的表单

Question

我在使用Symfony 2时遇到问题。当我尝试使用来自实体的数据填充表单时，我收到此错误：

“表单的视图数据应该是标量，数组或\ ArrayAccess的实例，但是是DateTime类的实例。您可以通过将”data_class“选项设置为”DateTime“或通过添加一个视图转换器，将类DateTime的实例转换为标量，数组或\ ArrayAccess的实例。“

我对Symfony 2的经验不多。要创建实体，我使用的是YAML选项。

感谢。

控制器代码：

public function editAction($id)
{
    $em = $this->getDoctrine()->getManager();
    $candidate = $em->getRepository('OUProjectBundle:Candidate')->findOneById($id); 
    $form = $this->createForm(new CandidateType(), $candidate);

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

CandidateType类：

namespace My\ProjectBundle\Form;

use Symfony\Component\Form\AbstractType;
use My\ProjectBundle\Entity\Candidate;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
use Doctrine\ORM\EntityRepository;

class CandidateType extends AbstractType
{

    public function buildForm(FormBuilderInterface $builder, array $options)
    {

        $builder->add('name', 'text', array('label'=>'Name:'));
        $builder->add('surname', 'text', array('label'=>'Surname:'));
        $builder->add('email', 'text', array('label'=>'Email:'));        
        $builder->add('phone', 'text', array('label'=>'Telephone:'));
        $builder->add('DOB', 'text', array('label'=>'Date of Birth:'));
        $builder->add('address', 'text', array('label'=>'Address'));
        $builder->add('town', 'text', array('label'=>'Town:'));
        $builder->add('city', 'text', array('label'=>'City:'));        
        $builder->add('post_code', 'text', array('label'=>'Post Code:'));
        $builder->add('file', 'file', array('label' => 'CV file (.docx)', 'required' => true));

    }

    public function getName()
    {
        return 'candidate';
    }

    public function getDefaultOptions(array $options)
    {
        return array(
            'data_class' => 'My\ProjectBundle\Entity\Candidate',
        );
    }
}

实体：

namespace OU\ProjectBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use My\ProjectBundle\Utils\DocReader;

/**
 * Candidate
 */
class Candidate
{
    /**
     * @var integer
     */
    private $id;

    /**
     * @var string
     */
    private $name;

    /**
     * @var string
     */
    private $surname;

    /**
     * @var \DateTime
     */
    private $dob;

    /**
     * @var string
     */
    private $phone;

    /**
     * @var string
     */
    private $address;

    /**
     * @var string
     */
    private $town;

    /**
     * @var string
     */
    private $city;

    /**
     * @var string
     */
    private $post_code;

    /**
     * @var string
     */
    private $cv_text;

    /**
     * @var string
     */
    private $cv_file;

    /**
     * @var \DateTime
     */
    private $createdAt;

    /**
     * @var \DateTime
     */
    private $updatedAt;

    /**
     * @var \DateTime
     */
    private $deletedAt;

    /**
     * @var \Doctrine\Common\Collections\Collection
     */
    private $skill;
    public $file;    

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

    /**
     * Get id
     *
     * @return integer 
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set name
     *
     * @param string $name
     * @return Candidate
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string 
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Set surname
     *
     * @param string $surname
     * @return Candidate
     */
    public function setSurname($surname)
    {
        $this->surname = $surname;

        return $this;
    }

    /**
     * Get surname
     *
     * @return string 
     */
    public function getSurname()
    {
        return $this->surname;
    }

    /**
     * Set dob
     *
     * @param \DateTime $dob
     * @return Candidate
     */
    public function setDob($dob)
    {
        $this->dob = new \DateTime($dob);

        return $this;
    }

    /**
     * Get dob
     *
     * @return \DateTime 
     */
    public function getDob()
    {
        return $this->dob;
    }

    /**
     * Set phone
     *
     * @param string $phone
     * @return Candidate
     */
    public function setPhone($phone)
    {
        $this->phone = $phone;

        return $this;
    }

    /**
     * Get phone
     *
     * @return string 
     */
    public function getPhone()
    {
        return $this->phone;
    }

    /**
     * Set address
     *
     * @param string $address
     * @return Candidate
     */
    public function setAddress($address)
    {
        $this->address = $address;

        return $this;
    }

    /**
     * Get address
     *
     * @return string 
     */
    public function getAddress()
    {
        return $this->address;
    }

    /**
     * Set town
     *
     * @param string $town
     * @return Candidate
     */
    public function setTown($town)
    {
        $this->town = $town;

        return $this;
    }

    /**
     * Get town
     *
     * @return string 
     */
    public function getTown()
    {
        return $this->town;
    }

    /**
     * Set city
     *
     * @param string $city
     * @return Candidate
     */
    public function setCity($city)
    {
        $this->city = $city;

        return $this;
    }

    /**
     * Get city
     *
     * @return string 
     */
    public function getCity()
    {
        return $this->city;
    }

    /**
     * Set post_code
     *
     * @param string $postCode
     * @return Candidate
     */
    public function setPostCode($postCode)
    {
        $this->post_code = $postCode;

        return $this;
    }

    /**
     * Get post_code
     *
     * @return string 
     */
    public function getPostCode()
    {
        return $this->post_code;
    }

    /**
     * Set cv_text
     *
     * @param string $cvText
     * @return Candidate
     */
    public function setCvText($cvText)
    {
        $this->cv_text = $cvText;

        return $this;
    }

    /**
     * Get cv_text
     *
     * @return string 
     */
    public function getCvText()
    {
        return $this->cv_text;
    }

    /**
     * Set cv_file
     *
     * @param string $cvFile
     * @return Candidate
     */
    public function setCvFile($cvFile)
    {
        $this->cv_file = $cvFile;

        return $this;
    }

    /**
     * Get cv_file
     *
     * @return string 
     */
    public function getCvFile()
    {
        return $this->cv_file;
    }

    /**
     * Set createdAt
     *
     * @param \DateTime $createdAt
     * @return Candidate
     */
    public function setCreatedAt($createdAt)
    {
        $this->createdAt = $createdAt;

        return $this;
    }

    /**
     * Get createdAt
     *
     * @return \DateTime 
     */
    public function getCreatedAt()
    {
        return $this->createdAt;
    }

    /**
     * Set updatedAt
     *
     * @param \DateTime $updatedAt
     * @return Candidate
     */
    public function setUpdatedAt($updatedAt)
    {
        $this->updatedAt = $updatedAt;

        return $this;
    }

    /**
     * Get updatedAt
     *
     * @return \DateTime 
     */
    public function getUpdatedAt()
    {
        return $this->updatedAt;
    }

    /**
     * Set deletedAt
     *
     * @param \DateTime $deletedAt
     * @return Candidate
     */
    public function setDeletedAt($deletedAt)
    {
        $this->deletedAt = $deletedAt;

        return $this;
    }

    /**
     * Get deletedAt
     *
     * @return \DateTime 
     */
    public function getDeletedAt()
    {
        return $this->deletedAt;
    }

    /**
     * Add skill
     *
     * @param \My\ProjectBundle\Entity\Skill $skill
     * @return Candidate
     */
    public function addSkill(\My\ProjectBundle\Entity\Skill $skill)
    {
        $this->skill[] = $skill;

        return $this;
    }

    /**
     * Remove skill
     *
     * @param \My\ProjectBundle\Entity\Skill $skill
     */
    public function removeSkill(\My\ProjectBundle\Entity\Skill $skill)
    {
        $this->skill->removeElement($skill);
    }

    /**
     * Get skill
     *
     * @return \Doctrine\Common\Collections\Collection 
     */
    public function getSkill()
    {
        return $this->skill;
    }
    /**
     * @ORM\PrePersist
     */
    public function preUpload()
    {
      if (null !== $this->file) {
        // do whatever you want to generate a unique name
          $extension = $this->file->guessExtension();
          if($extension === "zip") $extension = "docx";
          $this->setCvFile(uniqid().'.'.$extension);
          // if there is an error when moving the file, an exception will
          // be automatically thrown by move(). This will properly prevent
          // the entity from being persisted to the database on error
          $this->file->move($this->getUploadRootDir(), $this->cv_file);
          $this->setCvText(DocReader::readDocxFile($this->getAbsolutePath()));
      }
    }

    /**
     * @ORM\PrePersist
     */
    public function setCreatedAtValue()
    {
      if(!$this->getCreatedAt())
      {
        $this->createdAt = new \DateTime();
      }
    }

    /**
     * @ORM\PreUpdate
     */
    public function setUpdatedAtValue()
    {
        $this->updatedAt = new \DateTime();
    }

    /**
     * @ORM\PostPersist
     */
    public function upload()
    {
      if (null === $this->file) {
        return;
      }
      unset($this->file);
    }

    /**
     * @ORM\PostRemove
     */
    public function removeUpload()
    {
      if ($file = $this->getAbsolutePath()) {
        unlink($file);
      }
    }

    /**
     * @ORM\PostRemove
     */
    public function setDeletedAtValue()
    {
      if(!$this->getDeletedAt())
      {
        $this->deletedAt = new \DateTime();
      }
    }

    protected function getUploadDir()
    {
        return 'uploads/cvs';
    }

    protected function getUploadRootDir()
    {
        return __DIR__.'/../../../../web/'.$this->getUploadDir();
    }

    public function getWebPath()
    {
        return null === $this->getCvFile() ? null : $this->getUploadDir().'/'.$this->getCvFile();
    }

    public function getAbsolutePath()
    {
        return null === $this->getCvFile()? null : $this->getUploadRootDir().'/'.$this->getCvFile();
    }    
    /**
     * @var \Doctrine\Common\Collections\Collection
     */
    private $skill_candidate;


    /**
     * Add skill_candidate
     *
     * @param \My\ProjectBundle\Entity\SkillCandidate $skillCandidate
     * @return Candidate
     */
    public function addSkillCandidate(\My\ProjectBundle\Entity\SkillCandidate $skillCandidate)
    {
        $this->skill_candidate[] = $skillCandidate;

        return $this;
    }

    /**
     * Remove skill_candidate
     *
     * @param \My\ProjectBundle\Entity\SkillCandidate $skillCandidate
     */
    public function removeSkillCandidate(\My\ProjectBundle\Entity\SkillCandidate $skillCandidate)
    {
        $this->skill_candidate->removeElement($skillCandidate);
    }

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

    public function __toString()
    {
      return $this->getName().' '.$this->getSurname();
    }    
    /**
     * @var string
     */
    private $email;


    /**
     * Set email
     *
     * @param string $email
     * @return Candidate
     */
    public function setEmail($email)
    {
        $this->email = $email;

        return $this;
    }

    /**
     * Get email
     *
     * @return string 
     */
    public function getEmail()
    {
        return $this->email;
    }
}

Answer 1

在CandidateType类中，字段DOB为文本类型，在实体中为datetime格式 你可以使用这样的东西

$builder->add('DOB', 'date', array('input'  => 'datetime','label'=>'Date of Birth:'));

请参阅this date Field Type manual