symfony: Argument 4 passed to Symfony\Component\Security\Core\Event\VoteEvent::__construct() must be of the type integer, null given

Symfony version(s) affected: x.y.z 4.2.3 Description

I am following the tutorial and at the point of Voters my code is breaking. I get the following error:

Argument 4 passed to Symfony\Component\Security\Core\Event\VoteEvent::__construct() must be of the type integer, null given, called in /Applications/XAMPP/xamppfiles/htdocs/symfony-01/vendor/symfony/security-core/Authorization/Voter/TraceableVoter.php on line 40

The code is a bit messy now, because I tried to follow documentation and the tutorial (at least one should work, huh?). Changing “role” field type didn’t work. I don’t have idea for that.

How to reproduce

Voter.php

class MicroPostVoter extends Voter
{
const EDIT = 'edit';
const DELETE = 'delete';

protected function supports($attribute, $subject)
{

    // if the attribute isn't one we support, return false
    if (!in_array($attribute, [self::DELETE, self::EDIT])) {
        return false;
    }

    // only vote on Post objects inside this voter
    if (!$subject instanceof MicroPost) {
        return false;
    }

    return true;

    // replace with your own logic
    // https://symfony.com/doc/current/security/voters.html
    // return in_array($attribute, ['POST_EDIT', 'POST_VIEW'])
    //     && $subject instanceof \App\Entity\BlogPost;
}

protected function voteOnAttribute($attribute, $subject, TokenInterface $token)
{
    $user = $token->getUser();
    // if the user is anonymous, do not grant access
    if (!$user instanceof User) {
        return false;
    }

    /** @var MicroPost $microPost */
    $microPost = $subject;


    //... (check conditions and return true to grant permission) ...
    switch ($attribute) {
        case self::DELETE:
            // logic to determine if the user can EDIT
            // return true or false
            return $this->canDelete($microPost, $user);

            break;
        case self::EDIT:
            // logic to determine if the user can VIEW
            // return true or false
            return $this->canEdit($microPost, $user);
            break;
    }

    return false;
}

private function canEdit(MicroPost $microPost, User $user)
{
    return $user === $microPost->getUser();
}

private function canDelete(MicroPost $microPost, User $user)
{
    return $user === $microPost->getUser();
}`

Entity/User.php

` class User implements UserInterface, \Serializable { /** * @ORM\Id() * @ORM\GeneratedValue() * @ORM\Column(type=“integer”) */ private $id;

/**
 * @ORM\Column(type="string", length=180, unique=true)
 * @Assert\NotBlank()
 * @Assert\Length(min=5, max=50)
 */
private $username;

/**
 * @ORM\Column(type="json")
 */
private $roles = [];

/**
 * @var string The hashed password
 * @ORM\Column(type="string")
 */
private $password;

/**
 * @Assert\NotBlank()
 * @Assert\Length(min=8)
 */
private $plainPassword;

/**
 * @return mixed
 */
public function getPlainPassword()
{
    return $this->plainPassword;
}

/**
 * @param mixed $plainPassword
 */
public function setPlainPassword($plainPassword): void
{
    $this->plainPassword = $plainPassword;
}

/**
 * @ORM\Column(type="string", length=190, unique=true)
 * @Assert\NotBlank()
 * @Assert\Email()
 */
private $email;

/**
 * @ORM\Column(type="string", length=255)
 * @Assert\NotBlank()
 * @Assert\Length(min="4")
 */
private $fullName;

/**
 * @ORM\OneToMany(targetEntity="App\Entity\MicroPost", mappedBy="user")
 */
private $microPosts;

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

public function getId(): ?int
{
    return $this->id;
}

/**
 * A visual identifier that represents this user.
 *
 * @see UserInterface
 */
public function getUsername(): string
{
    return (string)$this->username;
}

public function setUsername(string $username): self
{
    $this->username = $username;

    return $this;
}

/**
 * @see UserInterface
 */
public function getRoles(): array
{
    $roles = $this->roles;
    // guarantee every user at least has ROLE_USER
    $roles[] = 'ROLE_USER';

    return array_unique($roles);
}

public function setRoles(array $roles): self
{
    $this->roles = $roles;

    return $this;
}

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

public function setPassword(string $password): self
{
    $this->password = $password;

    return $this;
}

/**
 * @see UserInterface
 */
public function getSalt()
{
    // not needed when using the "bcrypt" algorithm in security.yaml
}

/**
 * @see UserInterface
 */
public function eraseCredentials()
{
    // If you store any temporary, sensitive data on the user, clear it here
    // $this->plainPassword = null;
}

public function getEmail(): ?string
{
    return $this->email;
}

public function setEmail(string $email): self
{
    $this->email = $email;

    return $this;
}

public function getFullName(): ?string
{
    return $this->fullName;
}

public function setFullName(string $fullName): self
{
    $this->fullName = $fullName;

    return $this;
}

/**
 * String representation of object
 *
 * @link https://php.net/manual/en/serializable.serialize.php
 * @return string the string representation of the object or null
 * @since 5.1.0
 */
public function serialize()
{
    return serialize([
        $this->id,
        $this->username,
        $this->password
    ]);
}

/**
 * Constructs the object
 *
 * @link https://php.net/manual/en/serializable.unserialize.php
 * @param string $serialized <p>
 * The string representation of the object.
 * </p>
 * @return void
 * @since 5.1.0
 */
public function unserialize($serialized)
{
    list($this->id,
        $this->username,
        $this->password) = unserialize($serialized);
}

/**
 * @return Collection|MicroPost[]
 */
public function getMicroPosts(): Collection
{
    return $this->microPosts;
}

public function addMicroPost(MicroPost $microPost): self
{
    if (!$this->microPosts->contains($microPost)) {
        $this->microPosts[] = $microPost;
        $microPost->setUser($this);
    }

    return $this;
}

public function removeMicroPost(MicroPost $microPost): self
{
    if ($this->microPosts->contains($microPost)) {
        $this->microPosts->removeElement($microPost);
        // set the owning side to null (unless already changed)
        if ($microPost->getUser() === $this) {
            $microPost->setUser(null);
        }
    }

    return $this;
}

} ` Possible Solution

Additional context