<?php

namespace App\Models;

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

class InvoiceItem extends Model
{
    protected $fillable = [
        'invoice_id',
        'attendance_id',
        'description',
        'quantity',
        'unit_price',
        'amount',
    ];

    /**
     * The invoice this line item belongs to.
     */
    public function invoice(): BelongsTo
    {
        return $this->belongsTo(Invoice::class);
    }

    /**
     * The attendance record this line item is based on.
     */
    public function attendance(): BelongsTo
    {
        return $this->belongsTo(LessonAttendance::class, 'attendance_id');
    }
}