exchange-2.0/app/Models/Voucher.php

<?php

namespace App\Models;

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


class Voucher extends AbstractModel
{
    protected $table = 'vouchers';

    /**
     * @return HasMany
     */
    public function redemptions(): HasMany
    {
        return $this->hasMany(VoucherRedemption::class, 'voucher_id', 'id');
    }

    /**
     * @return BelongsTo
     */
    public function campaign(): BelongsTo
    {
        return $this->belongsTo(VoucherCampaign::class, 'voucher_campaign_id');
    }
}