exchange-2.0/app/Models/Receipt.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Relations\HasOne;


class Receipt extends AbstractModel
{
    protected $table = 'receipt';

    public function transaction(): HasOne
    {
        return $this->hasOne(Transaction::class, 'transaction_id', 'id');
    }
    
    public function currency(): HasOne
    {
        return $this->hasOne(Currency::class, 'currency_id', 'id');
    }
    
    public function original_currency(): HasOne
    {
        return $this->hasOne(Currency::class, 'original_currency_id', 'id');
    }

}