Binding Entities near the end of Chapter 10 #50711

MPAGenie · 2023-06-20T08:05:06Z

MPAGenie
Jun 20, 2023

I've been working through the book recently, and once it gets into the "pagination" section, a strange bug seems to appear on my local -

Binding entities to query parameters only allowed for entities that have an identifier. Class "App\Entity\Conference" does not have an identifier.

I've followed the book to the letter and been unable to work out why this was happening, until a random stack overflow thread I came across made note that this version of the book is for older versions of Symfony, and has a package missing, now long unsupported, that causes this bug. Any ideas?

yun548 · 2023-06-20T08:12:26Z

yun548
Jun 20, 2023

Your class needs a unique identifier so Doctrine can identify each record and paginate accordingly.

1 reply

MPAGenie Jun 20, 2023
Author

On what part? can you give a little more context? I'm still pretty new to all this

stof · 2023-06-20T08:28:28Z

stof
Jun 20, 2023
Collaborator

The Conference entity created in chapter 8 has an identifier field (named id). So to me, getting this error makes me think that your code does not actually correspond to following the book to the letter.

2 replies

MPAGenie Jun 21, 2023
Author

My Conference entity controller has ...
#[ORM\Id] #[ORM\GeneratedValue] #[ORM\Column] private ?int $id = null;

On lines 13-16. is that not correct?

yun548 Jun 22, 2023

This should not be in your Controller but in the Conference entity you generated using the command.

The generated entity should look like this :

namespace App\Entity;

use App\Repository\ConferenceRepository;
use Doctrine\ORM\Mapping as ORM;

#[ORM\Entity(repositoryClass: ConferenceRepository::class)]
class Conference
{
    #[ORM\Column(type: 'integer')]
    #[ORM\Id, ORM\GeneratedValue()]
    private $id;

    #[ORM\Column(type: 'string', length: 255)]
    private $city;

    // ...

    public function getCity(): ?string
    {
        return $this->city;
    }

    public function setCity(string $city): self
    {
        $this->city = $city;

        return $this;
    }

    // ...
}

I suggest you go over the database chapter one more time to make sure everything is in order there

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Binding Entities near the end of Chapter 10 #50711

MPAGenie Jun 20, 2023

Replies: 2 comments · 3 replies

yun548 Jun 20, 2023

MPAGenie Jun 20, 2023 Author

stof Jun 20, 2023 Collaborator

MPAGenie Jun 21, 2023 Author

yun548 Jun 22, 2023

MPAGenie
Jun 20, 2023

Replies: 2 comments 3 replies

yun548
Jun 20, 2023

MPAGenie Jun 20, 2023
Author

stof
Jun 20, 2023
Collaborator

MPAGenie Jun 21, 2023
Author