Symfony Call to a member function getRole() on string - php

Question

I am having troubles with user authorization.
This is my User
namespace AppBundle\Entity;
use Symfony\Component\Security\Core\User\UserInterface;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity
* #ORM\Table(name="users")
*/
class User implements UserInterface
{
/**
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*
* #var int id
*/
protected $id;
/**
* #ORM\Column(type="string", length=25)
*
* #var string username
*/
protected $username;
/**
* #ORM\Column(type="string", length=25)
*
* #var string password
*/
protected $password;
/**
* #ORM\Column(type="string", length=25)
*
* #var string firstName
*/
protected $firstName;
/**
* #ORM\Column(type="string", length=25)
*
* #var string lastName
*/
protected $lastName;
/**
* #ORM\Column(type="string", length=25)
*
* #var string email
*/
protected $email;
/**
* #ORM\Column(type="string", length=255)
*
* #var string salt
*/
protected $salt;
/**
* #ORM\ManyToMany(targetEntity="Role")
* #ORM\JoinTable(name="user_role",
* joinColumns={#ORM\JoinColumn(name="user_id", referencedColumnName="id")},
* inverseJoinColumns={#ORM\JoinColumn(name="role_id", referencedColumnName="id")}
* )
*
* #var ArrayCollection $userRoles
*/
protected $userRoles;
public function __construct()
{
$this->posts = new ArrayCollection();
$this->userRoles = new ArrayCollection();
$this->createdAt = new \DateTime();
}
public function getId()
{
return $this->id;
}
public function getUsername()
{
return $this->username;
}
public function getPassword()
{
return $this->password;
}
public function getFirstName()
{
return $this->firstName;
}
public function getLastName()
{
return $this->lastName;
}
public function getEmail()
{
return $this->email;
}
public function getSalt()
{
return $this->salt;
}
public function getUserRoles()
{
return $this->userRoles;
}
public function getRoles()
{
return $this->getUserRoles()->toArray();
}
public function setUsername($username)
{
$this->username = $username;
}
public function setPassword($password)
{
$this->password = $password;
}
public function setFirstName($firstName)
{
$this->firstName = $firstName;
}
public function setLastName($lastName)
{
$this->lastName = $lastName;
}
public function setEmail($email)
{
$this->email = $email;
}
public function setSalt($value)
{
$this->salt = $value;
}
public function eraseCredentials()
{
}
public function equals(UserInterface $user)
{
return md5($this->getUsername()) == md5($user->getUsername());
}
}
And this is my Role
namespace AppBundle\Entity;
use Symfony\Component\Security\Core\Role\RoleInterface;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity
* #ORM\Table(name="role")
*/
class Role implements RoleInterface
{
/**
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*
* #var integer $id
*/
protected $id;
/**
* #ORM\Column(type="string", length=255)
*
* #var string $name
*/
protected $name;
/**
* #ORM\Column(type="datetime", name="created_at")
*
* #var DateTime $createdAt
*/
protected $createdAt;
/**
* Геттер для id.
*
* #return integer The id.
*/
public function getId()
{
return $this->id;
}
/**
* Геттер для названия роли.
*
* #return string The name.
*/
public function getName()
{
return $this->name;
}
/**
* Сеттер для названия роли.
*
* #param string $value The name.
*/
public function setName($value)
{
$this->name = $value;
}
/**
* Геттер для даты создания роли.
*
* #return DateTime A DateTime object.
*/
public function getCreatedAt()
{
return $this->createdAt;
}
/**
* Конструктор класса
*/
public function __construct()
{
$this->createdAt = new \DateTime();
}
/**
* Реализация метода, требуемого интерфейсом RoleInterface.
*
* #return string The role.
*/
public function getRole()
{
return $this->getName();
}
}
RoleHierarchy.php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Security\Core\Role;
/**
* RoleHierarchy defines a role hierarchy.
*
* #author Fabien Potencier <fabien#symfony.com>
*/
class RoleHierarchy implements RoleHierarchyInterface
{
private $hierarchy;
protected $map;
/**
* Constructor.
*
* #param array $hierarchy An array defining the hierarchy
*/
public function __construct(array $hierarchy)
{
$this->hierarchy = $hierarchy;
$this->buildRoleMap();
}
/**
* {#inheritdoc}
*/
public function getReachableRoles(array $roles)
{
$reachableRoles = $roles;
foreach ($roles as $role) {
if (!isset($this->map[$role->getRole()])) {
continue;
}
foreach ($this->map[$role->getRole()] as $r) {
$reachableRoles[] = new Role($r);
}
}
return $reachableRoles;
}
protected function buildRoleMap()
{
$this->map = array();
foreach ($this->hierarchy as $main => $roles) {
$this->map[$main] = $roles;
$visited = array();
$additionalRoles = $roles;
while ($role = array_shift($additionalRoles)) {
if (!isset($this->hierarchy[$role])) {
continue;
}
$visited[] = $role;
$this->map[$main] = array_unique(array_merge($this->map[$main], $this->hierarchy[$role]));
$additionalRoles = array_merge($additionalRoles, array_diff($this->hierarchy[$role], $visited));
}
}
}
}
I am getting next error - FatalErrorException in RoleHierarchy.php line 43: Error: Call to a member function getRole() on string
How should i solve the problem?