如何從數據庫中獲取用戶角色

Question

我想知道數據庫中用戶的角色時遇到問題。這是我的代碼：

$user = $this->getDoctrine() 
    ->getRepository('DSBBundle:User') 
->findOneBy(array('email' => $email)); 

我試圖讓這樣的角色：

$role = $user->getRoles(); 

，但它不能正常工作，並顯示錯誤：

Notice: array to string conversion in ..... 

更新：這裏 我代碼在實體/ User.php

<?php 

namespace DSBBundle\Entity; 

use Doctrine\ORM\Mapping as ORM; 
use Symfony\Component\Validator\Constraints as Assert; 
use Symfony\Component\Security\Core\User\AdvancedUserInterface; 
use Doctrine\Common\Collections\ArrayCollection; 

//http://symfony.com/doc/current/book/security.html#book-security-encoding-user-password 
//password_hash('ryanpass', PASSWORD_BCRYPT, array('cost' => 12)); 
/* 
$factory = $this->get('security.encoder_factory'); 
$user = new Acme\UserBundle\Entity\User(); 

$encoder = $factory->getEncoder($user); 
$password = $encoder->encodePassword('ryanpass', $user->getSalt()); 
$user->setPassword($password); 
*/ 
// * @ORM\Table(name="dbo.[User]") 

/** 
* @ORM\Entity(repositoryClass="DSBBundle\Entity\UserRepository") 
*/ 
class User implements AdvancedUserInterface, \Serializable 
{ 
    /** 
    * @ORM\Id 
    * @ORM\Column(type="integer") 
    * @ORM\GeneratedValue(strategy="AUTO") 
    */ 
    public $id; 

    /** 
    * @ORM\Column(type="string", length=255, unique=true, options={"label" = "Username"}) 
    * @Assert\NotBlank 
    */ 
    public $username; 

    /** 
    * @ORM\Column(type="string", length=255) 
    */ 
    public $password; 

    /** 
    * @ORM\Column(type="string", length=255, options={"label" = "Name"}) 
    * @Assert\NotBlank 
    */ 
    public $name; 

    /** 
    * @ORM\Column(type="string", length=255, nullable=true, options={"label" = "Email"}) 
    */ 
    private $email; 

    /** 
    * @ORM\Column(name="is_active", type="boolean", options={"label" = "Active"}) 
    */ 
    private $isActive; 

    /** 
    * @ORM\ManyToMany(targetEntity="Role", inversedBy="users") 
    * 
    */ 
    private $roles; 

    /** 
    * @ORM\ManyToMany(targetEntity="School", inversedBy="users") 
    */ 
    protected $schools; 

//===== 

    public function __construct() 
    { 
     $this->roles = new ArrayCollection(); 
    } 

    public function getRoles() 
    { 
     return $this->roles->toArray(); 
    } 

    public function isAccountNonExpired() 
    { 
     return true; 
    } 

    public function isAccountNonLocked() 
    { 
     return true; 
    } 

    public function isCredentialsNonExpired() 
    { 
     return true; 
    } 

    public function isEnabled() 
    { 
     return $this->isActive; 
    } 

    /** 
    * @inheritDoc 
    */ 
    public function getSalt() 
    { 
     // you *may* need a real salt depending on your encoder 
     // see section on salt below 
     return null; 
    } 

    /** 
    * @inheritDoc 
    */ 
    public function eraseCredentials() 
    { 
    } 

    /** 
    * @see \Serializable::serialize() 
    */ 
    public function serialize() 
    { 
     return serialize(array(
      $this->id, 
      $this->username, 
      $this->password 
      //$this->salt, 
     )); 
    } 

    /** 
    * @see \Serializable::unserialize() 
    */ 
    public function unserialize($serialized) 
    { 
     list (
      $this->id, 
      $this->username, 
      $this->password 
      //$this->salt 
     ) = unserialize($serialized); 
    } 

//=======  

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

    /** 
    * Set username 
    * 
    * @param string $username 
    * 
    * @return User 
    */ 
    public function setUsername($username) 
    { 
     $this->username = $username; 

     return $this; 
    } 

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

    /** 
    * Set password 
    * 
    * @param string $password 
    * 
    * @return User 
    */ 
    public function setPassword($password) 
    { 
     $this->password = $password; 

     return $this; 
    } 

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

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

     return $this; 
    } 

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

    /** 
    * Set isActive 
    * 
    * @param boolean $isActive 
    * 
    * @return User 
    */ 
    public function setIsActive($isActive) 
    { 
     $this->isActive = $isActive; 

     return $this; 
    } 

    /** 
    * Get isActive 
    * 
    * @return boolean 
    */ 
    public function getIsActive() 
    { 
     return $this->isActive; 
    } 

    /** 
    * Add roles 
    * 
    * @param \DSBBundle\Entity\Role $roles 
    * 
    * @return User 
    */ 
    public function addRole(\DSBBundle\Entity\Role $roles) 
    { 
     $this->roles[] = $roles; 

     return $this; 
    } 

    /** 
    * Remove roles 
    * 
    * @param \DSBBundle\Entity\Role $roles 
    */ 
    public function removeRole(\DSBBundle\Entity\Role $roles) 
    { 
     $this->roles->removeElement($roles); 
    } 

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

     return $this; 
    } 

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


    /** 
    * Add school 
    * 
    * @param \DSBBundle\Entity\School $school 
    * 
    * @return User 
    */ 
    public function addSchool(\DSBBundle\Entity\School $school) 
    { 
     $this->schools[] = $school; 

     return $this; 
    } 

    /** 
    * Remove school 
    * 
    * @param \DSBBundle\Entity\School $school 
    */ 
    public function removeSchool(\DSBBundle\Entity\School $school) 
    { 
     $this->schools->removeElement($school); 
    } 

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

幫我 感謝

Answer 1

由於錯誤消息說你想你的roles的ArrayCollection /陣列某處轉換爲字符串。這是不對的。您應該像使用其他陣列或ArrayCollection一樣使用您的roles ArrayCollection。例如：要獲得ArrayCollection的第一個元素，您可以使用下一個代碼：

$primaryRole = $user->getRoles()->first(); 
// or 
$roles = $user->getRoles(); 
$primaryRole = $roles[0]; // but in this case it will throw you undefined key Exception if you will have empty array.