Symfony Maybe you forget to persist it in the entity manager? - php

Question

i need select username of entity " user "on my form, but i get this fail:
Entity of type "Doctrine\ORM\PersistentCollection" passed to the choice field must be managed. Maybe you forget to persist it in the entity manager?
i try add public function __toString() on my entity user, but dont work
form
class AsignarEventoFormType extends AbstractType{
public function buildForm(FormBuilderInterface $builder, array $options){
$builder->add('users', EntityType::class, [
'class' => User::class,
'query_builder' => function (EntityRepository $er) {
return $er->createQueryBuilder('u')
->orderBy('u.nombre', 'ASC');
},
'choice_label' => 'nombre',
]);
}
}
entity of user :
<?php
declare(strict_types=1);
namespace App\Entity;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Security\Core\User\UserInterface;
use Symfony\Component\Validator\Constraints as Assert;
use Doctrine\ORM\PersistentCollection;
/**
* #ORM\Entity
* #ORM\Table(name="user")
*/
class User implements UserInterface
{
/**
* #ORM\Id
* #ORM\Column(name="id", type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #ORM\Column(name="nombre", type="string", length=255, nullable=false)
*/
private $nombre;
/**
* #ORM\Column(name="apellido", type="string", length=255, nullable=false)
*/
private $apellido;
/**
* #var string|null
*
* #ORM\Column(name="email", type="string", length=255, nullable=true)
* #Assert\NotBlank
* #Assert\Email(
* message = "El email '{{ value }}' no es valido"
*
* )
*/
private $email;
/**
* #ORM\Column(name="password", type="string", length=255, nullable=false)
*/
private $password;
/**
* #ORM\Column(name="role", type="string", length=255, nullable=false)
*/
private $role;
/**
* #var \DateTime|null
*
* #ORM\Column(name="fecha", type="datetime", nullable=true)
*/
private $fecha;
/**
* #ORM\Column(name="foto", type="string", length=255, nullable=false)
*/
private $foto;
/**
* #ORM\ManyToMany(targetEntity="Evento", inversedBy="users", cascade={"persist"})
* #ORM\JoinTable(
* name="user_evento",
* joinColumns={
* #ORM\JoinColumn(name="user_id", referencedColumnName="id")
* },
* inverseJoinColumns={
* #ORM\JoinColumn(name="evento_id", referencedColumnName="id")
* }
* )
*/
private $eventos;
/**
* #ORM\ManyToMany(targetEntity="Sala", inversedBy="users", cascade={"persist"})
* #ORM\JoinTable(
* name="user_sala",
* joinColumns={
* #ORM\JoinColumn(name="user_id", referencedColumnName="id")
* },
* inverseJoinColumns={
* #ORM\JoinColumn(name="sala_id", referencedColumnName="id")
* }
* )
*/
private $salas;
public function __construct()
{
$this->eventos = new ArrayCollection();
$this->salas = new ArrayCollection();
}
public function getId(): int
{
return $this->id;
}
public function setNombre(string $nombre): self
{
$this->nombre = $nombre;
return $this;
}
public function getNombre(): string
{
return $this->nombre;
}
public function setApellido(string $apellido): self
{
$this->apellido = $apellido;
return $this;
}
public function getApellido(): string
{
return $this->apellido;
}
public function setEmail(string $email): self
{
$this->email = $email;
return $this;
}
public function getEmail(): string
{
return $this->email;
}
public function setPassword(string $password): self
{
$this->password = $password;
return $this;
}
public function getPassword(): string
{
return $this->password;
}
public function setRole(string $role): self
{
$this->role = $role;
return $this;
}
public function getRole(): string
{
return $this->role;
}
public function setFoto(string $foto): self
{
$this->foto = $foto;
return $this;
}
public function getFoto(): string
{
return $this->foto;
}
public function getFecha()
{
return $this->fecha;
}
public function setFecha($fecha): self
{
$this->fecha = $fecha;
return $this;
}
public function addEvento(Evento $evento): self
{
$this->eventos[] = $evento;
return $this;
}
public function removeEvento(Evento $evento): bool
{
return $this->eventos->removeElement($evento);
}
public function getEventos(): Collection
{
return $this->eventos;
}
public function addSala(Sala $sala): self
{
$this->salas[] = $salas;
return $this;
}
public function removeSala(Sala $sala): bool
{
return $this->salas->removeElement($sala);
}
public function getSalas(): Collection
{
return $this->salas;
}
public function getUsername(){
return $this->email;
}
public function getSalt(){
return null;
}
public function getRoles(){
return array('ROLE_USER');
}
public function eraseCredentials(){}
public function __toString() {
return $this->id;
}
}
capture 1
capture2

Answer 1

You should add multiple => true to your users form field options.