Error Type of App\Transformers\suratTransformer::$availableIncludes must be array (as in class League\Fractal\TransformerAbstract)

[odysahe]

I got an error Type of App\Transformers\suratTransformer::$availableIncludes must be array (as in class League\Fractal\TransformerAbstract) in laravel-fractal:"^5.8" and i'm using Laravel 8, php7.4

What's wrong with my code?
when I comment out $availableInclude everything works fine, but the includeTembusan I expect doesn't show up

This My SuratTransformers

<?php

namespace App\Transformers;

use App\suratM;
use League\Fractal\TransformerAbstract;

class suratTransformer extends TransformerAbstract
{
   
    // protected $defaultIncludes = [
    //     //
    // ];

    protected $availableIncludes = [
        'tembusan',
    ];

    public function transform(suratM $s)
    {
        return [
            'id_surat' => $s->id_surat_m,
            'no_surat' => $s->no_surat
        ];
    }

    public function includeTembusan(suratM $sm){
        $hasil = $sm->tembusan;
        return $this->collection($hasil, new tembusanTransformer);
    }
}

This my SuratModel

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class suratM extends Model
{
    protected $table = 'surat_masuk';
    protected $primaryKey = 'id_surat_m';

    public function tembusan(){
        return $this->hasMany(tembusanM::class, 'id_surat_m', 'id_surat_m');
    }
}

This my Controller

<?php

namespace App\Http\Controllers;

use App\suratM;
use App\Transformers\suratTransformer;
use Illuminate\Http\Request;

class testfractalC extends Controller
{
    public function index()
    {
        $data = suratM::find(6);
        return fractal()
        ->item($data)
        ->transformWith(new suratTransformer)
        ->includeTembusan()
        ->toArray();
    }
}

This my relation table

Can anyone explain where I'm going wrong? and what should i fix?

[0ly]

I had a similar problem with $defaultIncludes after upgrading a project from Laravel 5.5 (PHP 7.2) to Laravel 9 (PHP 8).

Try including the type within the property definition for $availableIncludes.

IE

 protected array $availableIncludes = [
        'tembusan',
    ];

[odysahe]

I hope it helps for laravel 9 users, but is it still not working for laravel version 8?

[jonaswebdev]

I'm using this solution on Laravel 8.65 and it's working well :)