我正在处理旨在上传文件和更新Symfony2中的数据库的表单。我想手动设置book_id字段的值，而不是允许用户在表单中更改它。因此在我的控制器中使用doctrine来保存文档之前我正在调用：
$documents->setBookId('1');
Unluckilly我收到错误，表明该学说无法识别上述硬编码值输入。
An exception occurred while executing 'INSERT INTO Documents (book_id, marker, document_date, link, notes) VALUES (?, ?, ?, ?, ?)' with params [null, "fdd", "2015-04-04", null, "test"]:
在我看来，这可能与book_id字段与Books有关。因此可能我应该使用setBook函数。你能告诉我如何正确地做到这一点吗？
我的控制器文件如下所示：
/**
* This code is aimed at checking if the book is chosen and therefore whether any further works may be carried out
*/
$session = new Session();
if(!$session->get("App_Books_Chosen_Lp")) return new RedirectResponse($this->generateUrl('app_listbooks'));
// Authorization goes here
$documents = new Documents();
$form = $this->createForm(new DocumentsType(), $documents);
$form->add('save', 'submit', array('label' => 'Dodaj dokument'));
$form->handleRequest($request);
if ($form->isValid()) {
$em = $this->getDoctrine()->getManager();
$documents->upload();
$documents->setBookId('1');
$em->persist($documents);
$em->flush();
}
return $this->render('AppBundle:Documents:adddocuments.html.twig', array('form' => $form->createView()));
文档类：
<?php
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\HttpFoundation\File\UploadedFile;
/**
* @ORM\Entity
* @ORM\Table(name="Documents")
* @ORM\HasLifecycleCallbacks
*/
class Documents
{
/**
* @ORM\Column(type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* @ORM\ManyToOne(targetEntity="Books", inversedBy="documents")
* @ORM\JoinColumn(name="book_id", referencedColumnName="id")
*/
protected $book;
/**
* @ORM\Column(type="integer")
*/
protected $book_id;
/**
* @ORM\Column(type="string", length=220)
*/
protected $marker;
/**
* @ORM\Column(type="date", length=220)
*/
protected $document_date;
/**
* @ORM\Column(type="string", length=220)
* @Assert\File(maxSize="6000000")
*/
protected $link;
/**
* @ORM\Column(type="text")
*/
protected $notes;
/**
* Get id
*
* @return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set book_id
*
* @param integer $bookId
* @return Documents
*/
public function setBookId($bookId)
{
$this->book_id = $bookId;
return $this;
}
/**
* Get book_id
*
* @return integer
*/
public function getBookId()
{
return $this->book_id;
}
/**
* Set marker
*
* @param string $marker
* @return Documents
*/
public function setMarker($marker)
{
$this->marker = $marker;
return $this;
}
/**
* Get marker
*
* @return string
*/
public function getMarker()
{
return $this->marker;
}
/**
* Set document_date
*
* @param \DateTime $documentDate
* @return Documents
*/
public function setDocumentDate($documentDate)
{
$this->document_date = $documentDate;
return $this;
}
/**
* Get document_date
*
* @return \DateTime
*/
public function getDocumentDate()
{
return $this->document_date;
}
/**
* Set link
*
* @param string $link
* @return Documents
*/
public function setLink($link)
{
$this->link = $link;
return $this;
}
/**
* Get link
*
* @return string
*/
public function getLink()
{
return $this->link;
}
/**
* Set notes
*
* @param string $notes
* @return Documents
*/
public function setNotes($notes)
{
$this->notes = $notes;
return $this;
}
/**
* Get notes
*
* @return string
*/
public function getNotes()
{
return $this->notes;
}
/**
* Set book
*
* @param \AppBundle\Entity\Books $book
* @return Documents
*/
public function setBook(\AppBundle\Entity\Books $book = null)
{
$this->book = $book;
return $this;
}
/**
* Get book
*
* @return \AppBundle\Entity\Books
*/
public function getBook()
{
return $this->book;
}
/*
* ### FILE UPLOAD PROCESS ###
*/
/**
* @Assert\File(maxSize="6000000")
*/
private $file;
/**
* Sets file.
*
* @param UploadedFile $file
*/
public function setFile(UploadedFile $file = null)
{
$this->file = $file;
}
/**
* Get file.
*
* @return UploadedFile
*/
public function getFile()
{
return $this->file;
}
public function getAbsolutePath()
{
return null === $this->path
? null
: $this->getUploadRootDir().'/'.$this->path;
}
public function getWebPath()
{
return null === $this->path
? null
: $this->getUploadDir().'/'.$this->path;
}
protected function getUploadRootDir()
{
// the absolute directory path where uploaded
// documents should be saved
return __DIR__.'/../../../../web/'.$this->getUploadDir();
}
protected function getUploadDir()
{
// get rid of the __DIR__ so it doesn't screw up
// when displaying uploaded doc/image in the view.
return 'uploads/documents';
}
public function upload()
{
// the file property can be empty if the field is not required
if (null === $this->getFile()) {
return;
}
// use the original file name here but you should
// sanitize it at least to avoid any security issues
// move takes the target directory and then the
// target filename to move to
$this->getFile()->move(
$this->getUploadRootDir(),
$this->getFile()->getClientOriginalName()
);
// set the path property to the filename where you've saved the file
$this->path = $this->getFile()->getClientOriginalName();
// clean up the file property as you won't need it anymore
$this->file = null;
}
}
答案 0 :(得分：0)
好的，首先，由于您使用的是ManyToOne关系，因此您实际上并不需要其他属性来引用该书 - book_id。您可以将其删除并仅保留book。
然后在您的控制器中，您必须查询该Book的数据库，并将该对象设置为Document。
你可以这样做：
$bookId = 1; // Following your example, let's say tou already know the book ID.
$book = $em->getReference('AppBundle:Books', $bookId);
// Check if we actually found a record and then set it to Documents
// Looking at your entity mapping, your reference to Book can not be null,
// but doing an extra check never hurts, since this is just an example.
if( $book ) {
$documents->setBook($book);
}
如果您想直接插入bookID，那么在您的实体中使用ManyToOne引用的目的是什么？最终，您必须正确地开始使用学说的关系和对象。此外，关于getReference方法的一个很酷的事情是，您正在获取对实体的引用，而无需从数据库加载实体 - 您将获得所谓的Proxy objects。
方法EntityManager＃getReference（$ entityName，$ identifier）允许您获取对已知标识符的实体的引用，而无需从数据库中加载该实体。例如，当您想要与具有标识符的实体建立关联时，这很有用，作为性能增强
您可以进一步了解此here.