ladill-pos/app/Models/PosSaleLine.php

<?php

namespace App\Models;

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

class PosSaleLine extends Model
{
    protected $fillable = [
        'pos_sale_id',
        'product_id',
        'name',
        'unit_price_minor',
        'quantity',
        'line_total_minor',
        'position',
    ];

    protected function casts(): array
    {
        return [
            'unit_price_minor' => 'integer',
            'quantity' => 'integer',
            'line_total_minor' => 'integer',
            'position' => 'integer',
        ];
    }

    public function sale(): BelongsTo
    {
        return $this->belongsTo(PosSale::class, 'pos_sale_id');
    }

    public function product(): BelongsTo
    {
        return $this->belongsTo(PosProduct::class, 'product_id');
    }
}