laralog/app/Models/Category.php

<?php

declare(strict_types=1);

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Spatie\MediaLibrary\HasMedia;
use Xpier\FilamentMediaLibrary\Models\MediaLibrary;
use Spatie\MediaLibrary\InteractsWithMedia;

class Category extends Model implements HasMedia
{
    use HasFactory;
    use InteractsWithMedia;

    protected $fillable = [
        'name',
        'slug',
        'display_order',
        'post_count',
        'description',
        'cover_media_id',
    ];

    public function posts(): HasMany
    {
        return $this->hasMany(Post::class);
    }

    public function coverMedia(): BelongsTo
    {
        return $this->belongsTo(MediaLibrary::class, 'cover_media_id');
    }

    public function coverImageUrl(): ?string
    {
        $libraryUrl = $this->coverMedia?->url;
        if (filled($libraryUrl)) {
            return (string) $libraryUrl;
        }

        return $this->getFirstMedia('cover')?->getUrl();
    }

    public function getUrlAttribute(): string
    {
        return route('category.show', $this->id);
    }

    public function registerMediaCollections(): void
    {
        $this->addMediaCollection('cover')
            ->useDisk(\App\Support\MediaDisk::name())
            ->singleFile();
    }
}