ladill-woo-manager/app/Models/WooCategory.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

class WooCategory extends Model
{
    protected $fillable = [
        'woo_store_id',
        'external_id',
        'parent_external_id',
        'name',
        'slug',
        'description',
        'product_count',
        'wc_updated_at',
        'metadata',
    ];

    protected $casts = [
        'wc_updated_at' => 'datetime',
        'metadata' => 'array',
    ];

    public function store(): BelongsTo
    {
        return $this->belongsTo(WooStore::class, 'woo_store_id');
    }

    public function children(): HasMany
    {
        return $this->hasMany(self::class, 'parent_external_id', 'external_id')
            ->whereColumn('woo_store_id', 'woo_categories.woo_store_id');
    }

    public function parentLabel(): ?string
    {
        if (! $this->parent_external_id) {
            return null;
        }

        return self::query()
            ->where('woo_store_id', $this->woo_store_id)
            ->where('external_id', $this->parent_external_id)
            ->value('name');
    }
}