我有朋友和类别——每个朋友都有一个类别。在主页上可以看到所有朋友的列表，并且有一个包含所有类别的下拉菜单和一个提交按钮 - 当您选择类别并单击它时，您只会看到该类别的朋友。
这是Category.php：
<?php
namespace EM\MyFriendsBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;
use Doctrine\Common\Collections\ArrayCollection;
/**
* EM\MyFriendsBundle\Entity\Category
* @ORM\Entity
* @ORM\Table(name="categories")
* @ORM\Entity(repositoryClass="EM\MyFriendsBundle\Entity\SameRepository")
*/
class Category
{
/**
* @ORM\Column(type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* @ORM\Column(type="string", length=100)
* @Assert\NotBlank()
* @Assert\MinLength(
* limit=3,
* message="The name is too short." )
*/
protected $name;
/**
* @ORM\Column(type="string", length=225, nullable=true)
*/
protected $description;
/**
* @ORM\ManyToOne(targetEntity="User", inversedBy="categories")
* @ORM\JoinColumn(name="user_id", referencedColumnName="id")
*/
protected $user;
/**
* @ORM\OneToMany(targetEntity="Friend", mappedBy="category")
* @ORM\OrderBy({"name" = "ASC"})
*/
protected $friends;
public function __construct()
{
$this->friends = new \Doctrine\Common\Collections\ArrayCollection();
}
public function getId()
{
return $this->id;
}
public function setName($name)
{
$this->name = $name;
}
public function getName()
{
return $this->name;
}
public function setDescription($description)
{
$this->description = $description;
}
public function getDescription()
{
return $this->description;
}
public function setUser(\EM\MyFriendsBundle\Entity\User $user)
{
$this->user = $user;
}
public function getUser()
{
return $this->user;
}
public function addFriend(\EM\MyFriendsBundle\Entity\Friend $friend)
{
$this->friends[] = $friend;
}
public function getFriends()
{
return $this->friends;
}
}
选择CatType.php：
<?php
namespace EM\MyFriendsBundle\Entity;
use Symfony\Component\Form\FormBuilder;
use Symfony\Component\Form\AbstractType;
class ChooseCatType extends AbstractType
{
protected $user;
function __construct($user)
{
$this->user = $user;
}
public function buildForm(FormBuilder $builder, array $options)
{
$user = $this->user;
$builder->add('name', 'entity', array(
'class' => 'EMMyFriendsBundle:Category',
'property' => 'name',
'empty_value' => 'All friends',
'required' => false,
'query_builder' => function ($repository) use ($user)
{ return $repository->createQueryBuilder('cat')
->select('cat')
->where('cat.user = :user')
->orderBy('cat.name', 'ASC')
->setParameter('user', $user);
}, ));
}
public function getName()
{
return 'choose_category';
}
}
这是控制器的操作：
public function filterAction(Request $request)
{
$this->init();
$cat = new Category();
$dd_form = $this->createForm(new ChooseCatType($this->user), $cat);
if($request->getMethod() == 'POST') {
$dd_form->bindRequest($request);
if($cat->getName() == null) {
return $this->redirect($this->generateUrl('home_display'));
}
$filter = $cat->getName()->getId();
if ($dd_form->isValid()) {
$friends = $this->em->getRepository('EMMyFriendsBundle:Friend')
->filterFriends($filter);
if(!$friends) {
$this->setFlash('There are no frieds in this category.', 'error');
return $this->redirect($this->generateUrl('home_display'));
}
}
return $this->render('EMMyFriendsBundle:Home:filtered_home.html.twig', array(
'friends' => $friends, 'category' => $cat->getName()->getName(),
'dd_form' => $dd_form->createView()));
}
return $this->redirect($this->generateUrl('home_display'));
}
}
其中init()集$this->em = $this->getDoctrine()->getEntityManager();和$this->user = $this->get('security.context')->getToken()->getUser();
我收到一个错误：Expected argument of type string, object given，但无法理解它来自哪里以及如何修复它。请问有什么帮助吗？这将不胜感激。我认为它发生在这一行$dd_form->bindRequest($request);，因为当我把exit;它放在它前面时程序退出，但是当我把它放在它后面时，它会显示错误。
另一件事是，当我删除
@Assert\MinLength(
* limit=3,
* message="The name is too short." )
它在Category.php中的 name 属性之上，一切正常。
任何想法都会有所帮助！谢谢你的时间！
还有一件事-为什么要获取我应该使用的类别的ID $cat->getName()->getId();？我认为它应该是 only $cat->getId()，但事实并非如此。