Service Injection in Processor Causes /api Route to Fail

[PicassoHouessou]

API Platform version(s) affected: 4.1.8 on Laravel

Description
After creating a processor in Laravel, if you inject a service into the processor’s constructor, accessing the /api route results in a 500 error, as shown in the image.

How to reproduce

<?php
//app/State/UserProcessor.php
declare(strict_types=1);

namespace App\State;

use ApiPlatform\Metadata\Operation;
use ApiPlatform\State\ProcessorInterface;

final class UserProcessor implements ProcessorInterface
{
     public function __construct(
        private ProcessorInterface $persistProcessor,
        private ProcessorInterface $removeProcessor,
    )
    {
    }
    public function process(mixed $data, Operation $operation, array $uriVariables = [], array $context = []): void
    {
        // Handle the state
    }
}

<?php
//app/Models/User.php
namespace App\Models;

// use Illuminate\Contracts\Auth\MustVerifyEmail;
use ApiPlatform\Metadata\ApiResource;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Notifications\Notifiable;
#[ApiResource(processor: 'App\State\UserProcessor')]
class User extends Authenticatable
{
    /** @use HasFactory<\Database\Factories\UserFactory> */
    use HasFactory, Notifiable;

    /**
     * The attributes that are mass assignable.
     *
     * @var list<string>
     */
    protected $fillable = [
        'name',
        'email',
        'password',
    ];

    /**
     * The attributes that should be hidden for serialization.
     *
     * @var list<string>
     */
    protected $hidden = [
        'password',
        'remember_token',
    ];

    /**
     * Get the attributes that should be cast.
     *
     * @return array<string, string>
     */
    protected function casts(): array
    {
        return [
            'email_verified_at' => 'datetime',
            'password' => 'hashed',
        ];
    }
}

[soyuka]

Create a service provider I'm not sure how we're supposed to know what services to inject in the UserProcessor.

[PicassoHouessou]

@soyuka

I used the following command to create the processor:

php artisan make:state-processor

This added the following line to the AppServiceProvider:

$this->app->tag(UserProcessor::class, ProcessorInterface::class);

Here is the content of the provider

<?php

namespace App\Providers;

use App\State\UserProcessor;
use ApiPlatform\State\ProcessorInterface;
use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     */
    public function register(): void
    {
        //
    }

    /**
     * Bootstrap any application services.
     */
    public function boot(): void
    {
        //

		$this->app->tag(UserProcessor::class, ProcessorInterface::class);
    }
}

However, it seems that this part of the documentation isn't working as expected:
https://api-platform.com/docs/core/state-processors/#laravel-state-processor-mechanism

[soyuka]

If you want both arguments to be properly injected you're missing something like:

$this->app->singleton(UserProcessor::class, function (Application $app) {
    return new UserProcessor(
        $app->make(\ApiPlatform\Laravel\Eloquent\State\ItemProvider::class),
        $app->make(\ApiPlatform\Laravel\Eloquent\State\RemoveProcessor::class),
    );
});

[PicassoHouessou]

Thank you.
This code works:

 $this->app->singleton(UserProcessor::class, function (Application $app) {
            return new UserProcessor(
                $app->make(\ApiPlatform\Laravel\Eloquent\State\PersistProcessor::class),
                $app->make(\ApiPlatform\Laravel\Eloquent\State\RemoveProcessor::class),
            );
        });

So I believe the documentation should be updated for both the state provider and the state processor sections.

[soyuka]

don't hesitate to update the documentation thanks!

[PicassoHouessou]

Okay. I will