Doctrine2多对一双向关系不起作用 [英] Doctrine2 Many-to-one bidirectional relationship not working

问题描述

我试图在两个实体之间进行双向关联。问题是，从书我可以得到他们的所有者，但是从所有者我不能得到所有的书。

这是代码的重要部分： p>

Acme\BookBundle\Entity\Book;

 code> / ** 
 * @ ORM\ManyToOne（targetEntity =Acme\UserBundle\Entity\User，inversedBy =owned_books）
 * @ ORM\JoinColumn （name =owner_id，referencedColumnName =id）
 * / 
 protected $ owner; 
 
 / ** 
 *获取所有者
 * 
 * @return Acme\UserBundle\Entity\User 
 * / 
 public function getOwner（）
 {
 return $ this-> owner; 
} 
  

Acme\UserBundle\Entity\User; strong>

  / ** 
 * @ ORM\OneToMany（targetEntity =Acme\BookBundle\Entity \Book，mappedBy =owner）
 * / 
 protected $ owned_books; 
 
 public function __construct（）
 {
 $ this-> owned_books = new \Doctrine\Common\Collections\ArrayCollection（）; 
} 
 
 / ** 
 *获得owned_books 
 * 
 * @return Doctrine\Common\Collections\Collection 
 * / 
 public function getOwnedBooks（）
 {
 return $ this-> owned_books; 
} 
  

然后，获取数据：

此作品

  $ book = $ this-> getDoctrine（） 
  - > getRepository（'BookBundle：Book'）
  - > find（1）; 
 
 $ owner = $ book-> getOwner（） - > getFirstName（）; 
  

这不工作（提供致命错误：调用未定义的方法Doctrine\ORM\PersistentCollection :: getName（））

  $ owner = $ this-> getDoctrine（）
  - > getRepository（'UserBundle：User'）
  - > find（1）; 
 
 $ books = $ owner-> getOwnedBooks（） - > getName（）; 
  

有谁知道我做错了什么？谢谢你提前。

解决方案

$ owner-> getOwnedBooks（）是一个所有者的集合。尝试用foreach循环循环遍历集合。

  $ books = $ owner-> getOwnedBooks（）; 
 foreach（$ books as $ book）{
 echo $ book-> getName（）。 '< br />'; 
} 
  

I'm trying to do a bidirectional association between 2 entities. The problem is that from Book I can get their Owner, but from Owner I can't get the books owned.

Here is the important part of the code:

Acme\BookBundle\Entity\Book;

/**
 * @ORM\ManyToOne(targetEntity="Acme\UserBundle\Entity\User", inversedBy="owned_books")
 * @ORM\JoinColumn(name="owner_id", referencedColumnName="id")
 */
protected $owner;

/**
 * Get owner
 *
 * @return Acme\UserBundle\Entity\User 
 */
public function getOwner()
{
    return $this->owner;
}

Acme\UserBundle\Entity\User;

/**
 * @ORM\OneToMany(targetEntity="Acme\BookBundle\Entity\Book", mappedBy="owner")
 */
protected $owned_books;

public function __construct()
{
    $this->owned_books = new \Doctrine\Common\Collections\ArrayCollection();
}

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

Then, to get the data:

This Works

$book = $this->getDoctrine()
  ->getRepository('BookBundle:Book')
  ->find(1);

$owner = $book->getOwner()->getFirstName();

This Doesn't work ( Gives Fatal error: Call to undefined method Doctrine\ORM\PersistentCollection::getName() )

$owner = $this->getDoctrine()
    ->getRepository('UserBundle:User')
    ->find(1);

$books = $owner->getOwnedBooks()->getName();

Does anyone know what I'm doing wrong? Thank you in advance.

解决方案

$owner->getOwnedBooks() is a collection of Owners. Try to loop through the collection with a foreach loop.

$books = $owner->getOwnedBooks();
foreach ($books as $book) {
    echo $book->getName() . ' <br/>';
} 

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