Symfony/Doctrine：查詢似乎是好的，但我仍然得到一個NULL

Question

我與教條檢索數據有問題。生成的查詢似乎是我所需要的（從我在_profiler /中看到的），但是當我試圖顯示它時，我得到一個很好的'NULL'。我不知道我錯過了什麼，但它真的很煩人...我真的需要你們:)

我的實體：

<?php 
namespace Wk\SiteBundle\Entity; 

use Doctrine\ORM\Mapping as ORM; 

/** 
* Wrote 
* 
* @ORM\Table(name="WROTE") 
* @ORM\Entity(repositoryClass="Wk\SiteBundle\Entity\WroteRepository") 
*/ 
class Wrote 
{ 
/** 
* @var \Books 
* 
* @ORM\Id 
* @ORM\ManyToOne(targetEntity="Books") 
* @ORM\JoinColumns({ 
* @ORM\JoinColumn(name="book_id", referencedColumnName="book_id") 
* }) 
*/ 
private $book; 

/** 
* @var \Authors 
* 
* @ORM\Id 
* @ORM\ManyToOne(targetEntity="Authors") 
* @ORM\JoinColumns({ 
* @ORM\JoinColumn(name="author_id", referencedColumnName="author_id") 
* }) 
*/ 
private $author; 



/** 
* Set book 
* 
* @param \Books $book 
* @return Wrote 
*/ 
public function setBook($book) 
{ 
    $this->book = $book; 

    return $this; 
} 

/** 
* Get book 
* 
* @return \Books 
*/ 
public function getBook() 
{ 
    return $this->book; 
} 

/** 
* Set author 
* 
* @param \Authors $author 
* @return Wrote 
*/ 
public function setAuthor($author) 
{ 
    $this->author = $author; 

    return $this; 
} 

/** 
* Get author 
* 
* @return \Authors 
*/ 
public function getAuthor() 
{ 
    return $this->author; 
} 
} 

我的倉庫：

class WroteRepository extends EntityRepository { 
public function authorFromBook($book) { 
    return $this->createQueryBuilder('w') 
     ->addSelect('a') 
     ->leftJoin('w.author', 'a') 
     ->where('w.book = :book') 
      ->setParameter('book', $book) 
     ->getQuery() 
     ->getResult(); 
} 
} 

行動從控制器：

public function feedAction() { 
    $user = $this->container->get('security.context')->getToken()->getUser(); 

    if (!is_object($user) || !$user instanceof Users) { 
     throw new AccessDeniedException('This user does not have access to this section.'); 
    } 

    $weezList = $this->getDoctrine() 
     ->getManager() 
     ->getRepository('WkSiteBundle:Weez') 
     ->getWeezList($user->getId()); 

    foreach ($weezList as $weez) { 
     $authorList = $this->getDoctrine() 
      ->getManager() 
      ->getRepository('WkSiteBundle:Wrote') 
      ->authorFromBook($weez->getBook()); 

     $weez->setAuthorsList($authorList);   
    } 

    $template_value = array(
     'weezList' => $weezList, 
    ); 

    return $this->render('WkSiteBundle:Default:feed.html.twig', $template_value); 
} 

嫩枝：

{% for weez in weezList %} 
    {{ dump(weez.authorsList) }} 
    {% for record in weez.authorsList %} 
     {% for au in record.author%} 
      yo {{ au }} 
     {% endfor %} 
    {% endfor %} 
{% endfor %} 

結果：

array(1) { [0]=> object(Wk\SiteBundle\Entity\Wrote)#415 (2) { ["book":"Wk\SiteBundle\Entity\Wrote":private]=> object(Proxies\__CG__\Wk\SiteBundle\Entity\Books)#422 (5) { ["__isInitialized__"]=> bool(true) ["bookId":"Wk\SiteBundle\Entity\Books":private]=> float(500) ["title":"Wk\SiteBundle\Entity\Books":private]=> string(16) "The Lean Startup" ["author":"Wk\SiteBundle\Entity\Books":private]=> int(214) ["image":"Wk\SiteBundle\Entity\Books":private]=> string(97) "http://bks7.books.google.fr/books?id=r9x-OXdzpPcC&printsec=frontcover&img=1&zoom=5&source=gbs_api" } ["author":"Wk\SiteBundle\Entity\Wrote":private]=> NULL } } 

你可以看到底：

["author":"Wk\SiteBundle\Entity\Wrote":private]=> NULL 

編輯： 由於要求在這裏是我的authorsList的東西：

private $authorsList; 

public function setAuthorsList($listAuthor) { 
    $this->authorsList = $listAuthor; 
} 

public function getAuthorsList() { 
    return $this->authorsList; 
} 

編輯2：（改變我在a.aitboudad的回答幫助下完成的）

$qb = $this->_em->createQueryBuilder(); 

    $qb->select('a') 
    ->from('WeezbookSiteBundle:Authors', 'a') 
    ->where ('a.authorId IN (SELECT a2.authorId FROM WeezbookSiteBundle:Wrote w JOIN w.author a2 WHERE w.book = :book)') 
     ->setParameter('book', $book); 

    return $qb->getQuery() 
       ->getResult(); 

Answer 1

只需使用一個查詢產生相同的結果通過在getWeezList方法使用leftjoin：

public function getWeezList($id) 
{ 
    $db = $this->createQueryBuilder('w') 
     ->addSelect('a') 
     ->leftjoin('w.author', 'a') 
     ->where('w.id = :id'). 
    ... 
    ... 
    return $db->getQuery()->getResult(); 
} 

在控制器中刪除此代碼：

foreach ($weezList as $weez) { 
    $authorList = $this->getDoctrine() 
     ->getManager() 
     ->getRepository('WkSiteBundle:Wrote') 
     ->authorFromBook($weez->getBook()); 

    $weez->setAuthorsList($authorList);   
}