Doctrine assignment error: Cannot assign Doctrine\ORM\PersistentCollection to property
i have a upload from where i would like to show all the catégories from the database but i keep getting an error with the EntityType i don't know why was working before.
This is the error: Cannot assign Doctrine\ORM\PersistentCollection to property App\Entity\Category::$posts of type Doctrine\Common\Collections\ArrayCollection
<?php
declare(strict_types=1);
namespace App\Entity;
use App\Repository\CategoryRepository;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
/**
* @ORM\Entity(repositoryClass=CategoryRepository::class)
*/
class Category
{
/**
* @ORM\Id
* @ORM\GeneratedValue
* @ORM\Column(type="integer")
*/
private int $id;
/**
* @ORM\Column(type="string", length=255)
*/
private string $name;
/**
* @ORM\OneToMany(targetEntity=Post::class, mappedBy="Category_id")
*/
private ArrayCollection $Posts;
public function __construct()
{
$this->posts = new ArrayCollection();
}
public function getId(): ?int
{
return $this->id;
}
public function getName(): ?string
{
return $this->name;
}
public function setName(string $name): self
{
$this->name = $name;
return $this;
}
/**
* @return Collection|Post[]
*/
public function gePosts(): Collection
{
return $this->posts;
}
public function addPost(Post $post): self
{
if (!$this->posts->contains($post)) {
$this->$posts[] = $posts;
$post->setCategoryId($this);
}
return $this;
}
public function removePost(Post $post): self
{
if ($this->posts->removeElement($post)) {
// set the owning side to null (unless already changed)
if ($post->getCategoryId() === $this) {
$post->setCategoryId(null);
}
}
return $this;
}
public function __toString(): string
{
return (string) $this->getName();
}
}
The upload Form where i am getting the error
<?php
declare(strict_types=1);
namespace App\Form\Post;
use App\Entity\Category;
use App\Entity\Post;
use Symfony\Bridge\Doctrine\Form\Type\EntityType;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\FileType;
use Symfony\Component\Form\Extension\Core\Type\TextareaType;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\Validator\Constraints\File;
use Symfony\Component\Validator\Constraints\NotBlank;
class UploadType extends AbstractType
{
/**
* @param \Symfony\Component\Form\FormBuilderInterface $builder
* @param array $options
*/
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('title', TextType::class, [
'constraints' => [
new NotBlank([
'message' => 'Please enter a valid Title. '
])
]
])
->add('category', EntityType::class, [
'mapped' => false,
'class' => Category::class,
'choice_label' => 'name',
'expanded' => true
])
->add('poster', FileType::class, [
'required' => false,
'constraints' => [
new File([
'maxSize' => '6000K',
'mimeTypes' => [
'image/x-png',
'image/jpeg',
],
'mimeTypesMessage' => 'Please upload a image file.'
])
]
])
->add('description', TextareaType::class, [
'constraints' => [
new NotBlank([
'message' => 'Please enter a valid Title. '
])
]
])
->add('mediainfo', TextareaType::class, [
'required' => false,
]);
}
/**
* @param \Symfony\Component\OptionsResolver\OptionsResolver $resolver
*/
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
'data_class' => Post::class,
]);
}
}
in the Post entity
/**
* @ORM\ManyToOne(targetEntity=Category::class, inversedBy="posts")
*/
private Category $Category_id;
Environment info:
- Symfony 5.2.5 (env: dev, debug: true)
- PHP Version: 8.0.3
- Database Driver & Version: 8.0.23-0ubuntu0.20.04.1
Solution 1:
After some digging a found the answer changing the ArrayCollection to Collection fixed my issue
change:
/**
* @ORM\OneToMany(targetEntity=Post::class, mappedBy="Category_id")
*/
private \Doctrine\Common\Collections\ArrayCollection $posts;
to:
/**
* @ORM\OneToMany(targetEntity=Post::class, mappedBy="Category_id")
*/
private \Doctrine\Common\Collections\Collection $posts;
Solution 2:
The problem is in th type hinting (ArrayCollection => Collection)
change:
/**
* @ORM\OneToMany(targetEntity=Post::class, mappedBy="Category_id")
*/
private ArrayCollection $Posts;
public function __construct()
{
$this->posts = new ArrayCollection();
}
by:
/**
* @ORM\OneToMany(targetEntity=Post::class, mappedBy="Category_id")
*/
private Collection $Posts;
public function __construct()
{
$this->posts = new ArrayCollection();
}