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OnyxException

•Created by OnyxException on 4/18/2025 in #❓┊help

“Undefined array key 0” when uploading an image

Solution It was a issue with my local php environment. After using a newer PHP version or testing it on my live server it works. If you get this issue, try install Laravel Herd or make a clean php install. What I’m trying to do and why I’m building an admin interface with Laravel 12, Filament 3.3 to manage my menu categories. Each category should optionally have a cover image:

FileUpload::make('cover_image')
    ->label('Cover Image')
    ->image()
    ->directory('category-covers')
    ->multiple(false)
    ->maxFiles(1)
    ->nullable();

FileUpload::make('cover_image')
    ->label('Cover Image')
    ->image()
    ->directory('category-covers')
    ->multiple(false)
    ->maxFiles(1)
    ->nullable();

What I did so far - Added the cover_image column via migration and included it in my Category model’s $fillable. - Ran php artisan view:clear, config:clear, etc. - Enforced single-file upload with multiple(false) and maxFiles(1). - created a single resource just for file uploads to test it Still, the upload process fails with:

ErrorException: Undefined array key 0
 at vendor/livewire/livewire/src/Features/SupportFileUploads/WithFileUploads.php:40

ErrorException: Undefined array key 0
 at vendor/livewire/livewire/src/Features/SupportFileUploads/WithFileUploads.php:40

Relevant parts of my setup

// composer.json (excerpt)
"require": {
  "php": "^8.2",
        "filament/filament": "^3.3",
        "filament/spatie-laravel-translatable-plugin": "^3.3",
        "laravel/framework": "^12.0",
        "laravel/tinker": "^2.10.1",
        "spatie/laravel-translatable": "^6.11"
},

// composer.json (excerpt)
"require": {
  "php": "^8.2",
        "filament/filament": "^3.3",
        "filament/spatie-laravel-translatable-plugin": "^3.3",
        "laravel/framework": "^12.0",
        "laravel/tinker": "^2.10.1",
        "spatie/laravel-translatable": "^6.11"
},

// app/Models/Category.php
namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Spatie\Translatable\HasTranslations;

class Category extends Model
{
    use HasTranslations;

    public $translatable = ['name'];
    protected $fillable = [
        'parent_id',
        'name',
        'order',
        'cover_image',
        'is_food',
    ];
}

// app/Models/Category.php
namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Spatie\Translatable\HasTranslations;

class Category extends Model
{
    use HasTranslations;

    public $translatable = ['name'];
    protected $fillable = [
        'parent_id',
        'name',
        'order',
        'cover_image',
        'is_food',
    ];
}

// In CategoryResource form()
FileUpload::make('cover_image')
    ->label('Cover Image')
    ->image()
    ->directory('category-covers')
    ->multiple(false)
    ->maxFiles(1)
    ->nullable(),

// In CategoryResource form()
FileUpload::make('cover_image')
    ->label('Cover Image')
    ->image()
    ->directory('category-covers')
    ->multiple(false)
    ->maxFiles(1)
    ->nullable(),

Question: How can I configure the FileUpload so that Filament/Livewire handles cover_image without throwing “Undefined array key 0”? Any guidance or tips are greatly appreciated!

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